Digimidi: yeah the link Resonant added up there ^ will get you started. You'll need to get in and tweak things though because that theme on its own won't get you what I got. You'll figure it out though.
Mauricio: It's definitely a pretty cool program for the price. I was sort of forced to use it due to a customer of mine wanting to be able to mess around with the files I recorded for him, so when he comes here, he likes me to use Reaper so he can take the project files back with him. I still don't prefer it over Sonar though...but I DO wish Sonar had the theme oriented options available.
Adding to our screensets, I'd love to see different consoles available with color options. The theme thing is so big in the Reaper community, they almost have competitions with it. It shows the love they have for that DAW. It's a really nice alternative in my opinion and you can change anything your heart desires inside of it. For some, it's too tedious and time consuming to tweak their entire DAW...but in my opinion, if I'm to look at something for hours, I need it to be attractive. I hated pro tools for years because it just reminded me of a DOS based program. I can't help it, looks are important to me as narrow-minded as that sounds. That said, the program works well...so the looks now match the power. :)
-Danny