Yes. If the Interface module is already loaded, set your RGBA value in Assets\Modules\Interface\Resource\Themes\Civ4\Civ4Theme_Common.thm
Code:GColor .BG = GColor( 92, 138, 121, 255) : GFC_Control_Color; //Set for dynamic color change
Predefined sets are in Assets\Modules\Interface\colorSets.xml
That works. I was using Civ4 HUD Color Tool.exe to do custom colors. Is there a way to not break that?