diff --git a/BREAKING_CHANGES.md b/BREAKING_CHANGES.md
index aca7ef9474..54e9ff450d 100644
--- a/BREAKING_CHANGES.md
+++ b/BREAKING_CHANGES.md
@@ -2,6 +2,27 @@
 
 # develop
 
+## Change
+
+The background colour of the Toolbar::CustomisationDialog has been changed from
+white to a new, customisable value, that matches Toolbar::backgroundColourId by
+default.
+
+**Possible Issues**
+
+User interfaces that use Toolbar::CustomisationDialog will render differently.
+
+**Workaround**
+
+You can customise the new colour using LookAndFeel::setColour() using
+Toolbar::customisationDialogBackgroundColourId.
+
+**Rationale**
+
+Previously there was no way to customise the dialog's background colour and the
+fixed white colour was inappropriate for most user interfaces.
+
+
 ## Change
 
 ProfileHost::enableProfile and ProfileHost::disableProfile have been combined
diff --git a/modules/juce_gui_basics/lookandfeel/juce_LookAndFeel_V2.cpp b/modules/juce_gui_basics/lookandfeel/juce_LookAndFeel_V2.cpp
index c44236fb53..1440864278 100644
--- a/modules/juce_gui_basics/lookandfeel/juce_LookAndFeel_V2.cpp
+++ b/modules/juce_gui_basics/lookandfeel/juce_LookAndFeel_V2.cpp
@@ -131,6 +131,7 @@ LookAndFeel_V2::LookAndFeel_V2()
         Toolbar::buttonMouseDownBackgroundColourId, 0x800000ff,
         Toolbar::labelTextColourId,                 0xff000000,
         Toolbar::editingModeOutlineColourId,        0xffff0000,
+        Toolbar::customisationDialogBackgroundColourId, 0xfff6f8f9,
 
         DrawableButton::textColourId,               0xff000000,
         DrawableButton::textColourOnId,             0xff000000,
diff --git a/modules/juce_gui_basics/lookandfeel/juce_LookAndFeel_V4.cpp b/modules/juce_gui_basics/lookandfeel/juce_LookAndFeel_V4.cpp
index d005ca6a54..58dbd14762 100644
--- a/modules/juce_gui_basics/lookandfeel/juce_LookAndFeel_V4.cpp
+++ b/modules/juce_gui_basics/lookandfeel/juce_LookAndFeel_V4.cpp
@@ -1431,6 +1431,7 @@ void LookAndFeel_V4::initialiseColours()
         Toolbar::buttonMouseDownBackgroundColourId, currentColourScheme.getUIColour (ColourScheme::UIColour::widgetBackground).contrasting (0.5f).getARGB(),
         Toolbar::labelTextColourId,                 currentColourScheme.getUIColour (ColourScheme::UIColour::defaultText).getARGB(),
         Toolbar::editingModeOutlineColourId,        currentColourScheme.getUIColour (ColourScheme::UIColour::outline).getARGB(),
+        Toolbar::customisationDialogBackgroundColourId, currentColourScheme.getUIColour (ColourScheme::UIColour::widgetBackground).getARGB(),
 
         DrawableButton::textColourId,               currentColourScheme.getUIColour (ColourScheme::UIColour::defaultText).getARGB(),
         DrawableButton::textColourOnId,             currentColourScheme.getUIColour (ColourScheme::UIColour::highlightedText).getARGB(),
diff --git a/modules/juce_gui_basics/widgets/juce_Toolbar.cpp b/modules/juce_gui_basics/widgets/juce_Toolbar.cpp
index d02db8607d..8a1a5547e7 100644
--- a/modules/juce_gui_basics/widgets/juce_Toolbar.cpp
+++ b/modules/juce_gui_basics/widgets/juce_Toolbar.cpp
@@ -660,7 +660,10 @@ class Toolbar::CustomisationDialog final : public DialogWindow
 {
 public:
     CustomisationDialog (ToolbarItemFactory& factory, Toolbar& bar, int optionFlags)
-        : DialogWindow (TRANS ("Add/remove items from toolbar"), Colours::white, true, true),
+        : DialogWindow (TRANS ("Add/remove items from toolbar"),
+                        bar.findColour (Toolbar::customisationDialogBackgroundColourId),
+                        true,
+                        true),
           toolbar (bar)
     {
         setContentOwned (new CustomiserPanel (factory, toolbar, optionFlags), true);
diff --git a/modules/juce_gui_basics/widgets/juce_Toolbar.h b/modules/juce_gui_basics/widgets/juce_Toolbar.h
index ffc9ef4d42..b9d92ac74a 100644
--- a/modules/juce_gui_basics/widgets/juce_Toolbar.h
+++ b/modules/juce_gui_basics/widgets/juce_Toolbar.h
@@ -246,8 +246,10 @@ public:
         labelTextColourId           = 0x1003240,        /**< A colour to use for drawing the text under buttons
                                                              when the style is set to iconsWithText or textOnly. */
 
-        editingModeOutlineColourId  = 0x1003250   /**< A colour to use for an outline around buttons when
+        editingModeOutlineColourId  = 0x1003250,  /**< A colour to use for an outline around buttons when
                                                        the customisation dialog is active and the mouse moves over them. */
+
+        customisationDialogBackgroundColourId = 0x1003260 /**< A colour used to paint the background of the CustomisationDialog. */
     };
 
     //==============================================================================