diff --git a/Source/Editor/CustomEditors/Editors/ArrayEditor.cs b/Source/Editor/CustomEditors/Editors/ArrayEditor.cs
index 41ca6ba86..af7bff167 100644
--- a/Source/Editor/CustomEditors/Editors/ArrayEditor.cs
+++ b/Source/Editor/CustomEditors/Editors/ArrayEditor.cs
@@ -52,7 +52,7 @@ namespace FlaxEditor.CustomEditors.Editors
                     else
                     {
                         // Initialize new entries with default values
-                        var defaultValue = TypeUtils.GetDefaultValue(new ScriptType(elementType));
+                        var defaultValue = TypeUtils.GetDefaultValue(new ScriptType(elementType), NotNullItems);
                         for (int i = oldSize; i < newSize; i++)
                             newValues.SetValue(defaultValue, i);
                     }
@@ -60,7 +60,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 else if (newSize > 0)
                 {
                     // Initialize new entries with default values
-                    var defaultValue = TypeUtils.GetDefaultValue(new ScriptType(elementType));
+                    var defaultValue = TypeUtils.GetDefaultValue(new ScriptType(elementType), NotNullItems);
                     for (int i = 0; i < newSize; i++)
                         newValues.SetValue(defaultValue, i);
                 }
diff --git a/Source/Editor/CustomEditors/Editors/CollectionEditor.cs b/Source/Editor/CustomEditors/Editors/CollectionEditor.cs
index f7c6c1e06..2ae2e6ea5 100644
--- a/Source/Editor/CustomEditors/Editors/CollectionEditor.cs
+++ b/Source/Editor/CustomEditors/Editors/CollectionEditor.cs
@@ -77,11 +77,15 @@ namespace FlaxEditor.CustomEditors.Editors
             }
         }
 
+        /// <summary>
+        /// Determines if value of collection can be null.
+        /// </summary>
+        protected bool NotNullItems;
         private IntegerValueElement _size;
+        private Color _background;
         private int _elementsCount;
         private bool _readOnly;
         private bool _canReorderItems;
-        private bool _notNullItems;
 
         /// <summary>
         /// Gets the length of the collection.
@@ -105,7 +109,7 @@ namespace FlaxEditor.CustomEditors.Editors
         {
             _readOnly = false;
             _canReorderItems = true;
-            _notNullItems = false;
+            NotNullItems = false;
 
             // No support for different collections for now
             if (HasDifferentValues || HasDifferentTypes)
@@ -118,13 +122,19 @@ namespace FlaxEditor.CustomEditors.Editors
             Type overrideEditorType = null;
             float spacing = 10.0f;
             var collection = (CollectionAttribute)attributes?.FirstOrDefault(x => x is CollectionAttribute);
-            if (collection != null)
+            if (collection is null)
+            {
+                _readOnly = false;
+                NotNullItems = false;
+                _background = new Color(1f, 1f, 1f, 0.08f);
+            }
+            else
             {
                 // TODO: handle NotNullItems by filtering child editors SetValue
-
                 _readOnly = collection.ReadOnly;
                 _canReorderItems = collection.CanReorderItems;
-                _notNullItems = collection.NotNullItems;
+                NotNullItems = collection.NotNullItems;
+                _background = collection.BackgroundColor;
                 overrideEditorType = TypeUtils.GetType(collection.OverrideEditorTypeName).Type;
                 spacing = collection.Spacing;
             }
@@ -146,6 +156,8 @@ namespace FlaxEditor.CustomEditors.Editors
             // Elements
             if (size > 0)
             {
+                var panel = layout.VerticalPanel();
+                panel.Panel.BackgroundColor = _background;
                 var elementType = ElementType;
                 if (_canReorderItems)
                 {
@@ -153,7 +165,7 @@ namespace FlaxEditor.CustomEditors.Editors
                     {
                         if (i != 0 && spacing > 0f)
                         {
-                            if (layout.Children.Count > 0 && layout.Children[layout.Children.Count - 1] is PropertiesListElement propertiesListElement)
+                            if (panel.Children.Count > 0 && panel.Children[panel.Children.Count - 1] is PropertiesListElement propertiesListElement)
                             {
                                 if (propertiesListElement.Labels.Count > 0)
                                 {
@@ -166,12 +178,12 @@ namespace FlaxEditor.CustomEditors.Editors
                             }
                             else
                             {
-                                layout.Space(spacing);
+                                panel.Space(spacing);
                             }
                         }
 
                         var overrideEditor = overrideEditorType != null ? (CustomEditor)Activator.CreateInstance(overrideEditorType) : null;
-                        layout.Object(new CollectionItemLabel(this, i), new ListValueContainer(elementType, i, Values), overrideEditor);
+                        panel.Object(new CollectionItemLabel(this, i), new ListValueContainer(elementType, i, Values), overrideEditor);
                     }
                 }
                 else
@@ -180,14 +192,14 @@ namespace FlaxEditor.CustomEditors.Editors
                     {
                         if (i != 0 && spacing > 0f)
                         {
-                            if (layout.Children.Count > 0 && layout.Children[layout.Children.Count - 1] is PropertiesListElement propertiesListElement)
+                            if (panel.Children.Count > 0 && panel.Children[panel.Children.Count - 1] is PropertiesListElement propertiesListElement)
                                 propertiesListElement.Space(spacing);
                             else
-                                layout.Space(spacing);
+                                panel.Space(spacing);
                         }
 
                         var overrideEditor = overrideEditorType != null ? (CustomEditor)Activator.CreateInstance(overrideEditorType) : null;
-                        layout.Object("Element " + i, new ListValueContainer(elementType, i, Values), overrideEditor);
+                        panel.Object("Element " + i, new ListValueContainer(elementType, i, Values), overrideEditor);
                     }
                 }
             }
diff --git a/Source/Editor/CustomEditors/Editors/DictionaryEditor.cs b/Source/Editor/CustomEditors/Editors/DictionaryEditor.cs
index 1a57fa59d..62a8459f7 100644
--- a/Source/Editor/CustomEditors/Editors/DictionaryEditor.cs
+++ b/Source/Editor/CustomEditors/Editors/DictionaryEditor.cs
@@ -135,6 +135,7 @@ namespace FlaxEditor.CustomEditors.Editors
         }
 
         private IntegerValueElement _size;
+        private Color _background;
         private int _elementsCount;
         private bool _readOnly;
         private bool _notNullItems;
@@ -164,8 +165,6 @@ namespace FlaxEditor.CustomEditors.Editors
         /// <inheritdoc />
         public override void Initialize(LayoutElementsContainer layout)
         {
-            _readOnly = false;
-            _notNullItems = false;
 
             // No support for different collections for now
             if (HasDifferentValues || HasDifferentTypes)
@@ -185,12 +184,20 @@ namespace FlaxEditor.CustomEditors.Editors
             if (attributes != null)
             {
                 var collection = (CollectionAttribute)attributes.FirstOrDefault(x => x is CollectionAttribute);
-                if (collection != null)
+                if (collection is null)
                 {
                     // TODO: handle ReadOnly and NotNullItems by filtering child editors SetValue
 
+
+                    _readOnly = false;
+                    _notNullItems = false;
+                    _background = new Color(1f, 1f, 1f, 0.08f);
+                }
+                else
+                {
                     _readOnly = collection.ReadOnly;
                     _notNullItems = collection.NotNullItems;
+                    _background = collection.BackgroundColor;
                     overrideEditorType = TypeUtils.GetType(collection.OverrideEditorTypeName).Type;
                     spacing = collection.Spacing;
                 }
@@ -213,13 +220,15 @@ namespace FlaxEditor.CustomEditors.Editors
             // Elements
             if (size > 0)
             {
+                var panel = layout.VerticalPanel();
+                panel.Panel.BackgroundColor = _background;
                 var keysEnumerable = ((IDictionary)Values[0]).Keys.OfType<object>();
                 var keys = keysEnumerable as object[] ?? keysEnumerable.ToArray();
                 for (int i = 0; i < size; i++)
                 {
                     if (i != 0 && spacing > 0f)
                     {
-                        if (layout.Children.Count > 0 && layout.Children[layout.Children.Count - 1] is PropertiesListElement propertiesListElement)
+                        if (panel.Children.Count > 0 && panel.Children[panel.Children.Count - 1] is PropertiesListElement propertiesListElement)
                         {
                             if (propertiesListElement.Labels.Count > 0)
                             {
@@ -232,13 +241,13 @@ namespace FlaxEditor.CustomEditors.Editors
                         }
                         else
                         {
-                            layout.Space(spacing);
+                            panel.Space(spacing);
                         }
                     }
 
                     var key = keys.ElementAt(i);
                     var overrideEditor = overrideEditorType != null ? (CustomEditor)Activator.CreateInstance(overrideEditorType) : null;
-                    layout.Object(new DictionaryItemLabel(this, key), new DictionaryValueContainer(new ScriptType(valueType), key, Values), overrideEditor);
+                    panel.Object(new DictionaryItemLabel(this, key), new DictionaryValueContainer(new ScriptType(valueType), key, Values), overrideEditor);
                 }
             }
             _elementsCount = size;
@@ -407,7 +416,7 @@ namespace FlaxEditor.CustomEditors.Editors
                         }
                     } while (!isUnique);
 
-                    newValues[Convert.ChangeType(uniqueKey, keyType)] = TypeUtils.GetDefaultValue(new ScriptType(valueType));
+                    newValues[Convert.ChangeType(uniqueKey, keyType)] = TypeUtils.GetDefaultValue(new ScriptType(valueType), _notNullItems);
                 }
                 else if (keyType.IsEnum)
                 {
@@ -428,7 +437,7 @@ namespace FlaxEditor.CustomEditors.Editors
                         }
                     } while (!isUnique && uniqueKeyIndex < enumValues.Length);
 
-                    newValues[enumValues.GetValue(uniqueKeyIndex)] = TypeUtils.GetDefaultValue(new ScriptType(valueType));
+                    newValues[enumValues.GetValue(uniqueKeyIndex)] = TypeUtils.GetDefaultValue(new ScriptType(valueType), _notNullItems);
                 }
                 else if (keyType == typeof(string))
                 {
@@ -448,7 +457,7 @@ namespace FlaxEditor.CustomEditors.Editors
                         }
                     } while (!isUnique);
 
-                    newValues[uniqueKey] = TypeUtils.GetDefaultValue(new ScriptType(valueType));
+                    newValues[uniqueKey] = TypeUtils.GetDefaultValue(new ScriptType(valueType), _notNullItems);
                 }
                 else
                 {
diff --git a/Source/Editor/CustomEditors/Editors/ListEditor.cs b/Source/Editor/CustomEditors/Editors/ListEditor.cs
index 0c6efaea4..a8871329a 100644
--- a/Source/Editor/CustomEditors/Editors/ListEditor.cs
+++ b/Source/Editor/CustomEditors/Editors/ListEditor.cs
@@ -22,9 +22,7 @@ namespace FlaxEditor.CustomEditors.Editors
             var list = (IList)listType.CreateInstance();
             var defaultValue = Scripting.TypeUtils.GetDefaultValue(ElementType);
             for (int i = 0; i < size; i++)
-            {
                 list.Add(defaultValue);
-            }
             return list;
         }
 
@@ -57,7 +55,7 @@ namespace FlaxEditor.CustomEditors.Editors
                     else
                     {
                         // Initialize new entries with default values
-                        var defaultValue = Scripting.TypeUtils.GetDefaultValue(elementType);
+                        var defaultValue = Scripting.TypeUtils.GetDefaultValue(elementType, NotNullItems);
                         for (int i = oldSize; i < newSize; i++)
                             newValues.Add(defaultValue);
                     }
@@ -65,7 +63,7 @@ namespace FlaxEditor.CustomEditors.Editors
                 else if (newSize > 0)
                 {
                     // Fill new entries with default value
-                    var defaultValue = Scripting.TypeUtils.GetDefaultValue(elementType);
+                    var defaultValue = Scripting.TypeUtils.GetDefaultValue(elementType, NotNullItems);
                     for (int i = oldSize; i < newSize; i++)
                         newValues.Add(defaultValue);
                 }
@@ -86,9 +84,7 @@ namespace FlaxEditor.CustomEditors.Editors
             var cloned = (IList)listType.CreateInstance();
 
             for (int i = 0; i < size; i++)
-            {
                 cloned.Add(list[i]);
-            }
 
             return cloned;
         }
diff --git a/Source/Engine/Scripting/Attributes/CollectionAttribute.cs b/Source/Engine/Scripting/Attributes/CollectionAttribute.cs
index 78781d3f9..61beac368 100644
--- a/Source/Engine/Scripting/Attributes/CollectionAttribute.cs
+++ b/Source/Engine/Scripting/Attributes/CollectionAttribute.cs
@@ -34,5 +34,10 @@ namespace FlaxEngine
         /// The spacing amount between collection items in the UI.
         /// </summary>
         public float Spacing;
+
+        /// <summary>
+        /// Background color of the collection.
+        /// </summary>
+        public Color BackgroundColor = new Color(1f, 1f, 1f, 0.08f);
     }
 }