I don't change skins for programs very much, and I don't change the theme for Windows, either. To me, what matter is how they work, not how they look.
Same philosophy here Jingtian. All I change is my desktop.
Might sound boring to some though.
Playing with and learning of new software is more fun than a few programs and changing colours.
Still love to see people who are artistic though, might be why I don't play much with colours, artist I am not.
Still draw stick figures for humans....LOL