Actually, the theme part of it (sans the background) is super simple to do. Just take a look at how flux/bbox themes are made and you can really do some cool stuff. I did 2 BlackBox Lexx themes in about 5 minutes. If I would have spent more like 30 minutes I probably could have done something very pretty. The actually color hushing on the bar and windows is pretty simple, but again it's something that comes with looking at the config file.