Inspired by this amazingly funky Energy XT theme -
http://asseca.com/wiki/Skins/ModernRetro
I cloned and added to it to work with reaper. Notice the XT Sequencer floating in the lower right. Looks seemless between the programs. The toolbar icons are pretty much from scratch. I will likely incorporate them in some other theme I come up with.
Enjoy. Always open to feedback, I'm sure most wont like the item background and peak colors - feel free to change them.