Coloring standard buttons

[Billtopia]

What is the best way ( or is there more than one ) to change a buttons color from the standard WoW red to green (or whatever) if the option it toggles is enabled or not... For example I have a list of people that is generated from the real-id / battle-tag friends list. The addon puts asterisks around the names that it is selected to alert for... I was wondering if I could change the button colors as well to make it easier to differentiate the enabled ones from the non-enabled? I searched the web and here but I don't think I found what I was looking for...