Xcode plugin for replace the suggested colors in xcode.
Go to Edit->Create SuggestedColors file and a plist will be created. Add colors there with NAME and HEX VALUE
Change useMyColors entry to activate/deactivate it
In any case, relaunch Xcode to load it.
1- I change useMyColors to NO/YES but the Interface Builder doesn't update FIX: Alt-tab to another window and it should refresh