This is version 2 of the HUD color adjustment utility that I wrote out of frustration.
It has a few bug fixes, and I've released the source code with it, for those who like to tinker. Be sure to read the readme file.
The forum thread is here: http://forums.civfanatics.com/showthread.php?t=432883
Civ4 HUD Color Utility Version 2 2016-10-05
Civ4 HUD Color Utility Version 2