I'm releasing what I have so far and letting the community take over from here. I will not be finishing this.
You hereby have my complete permission to make as many modifications as you like and release them. Just be sure you credit me somewhere. You do not have to PM me or contact me in any way - this is open-source.
The only things I can remember that's not done in this is the hover images and the irrational system tray placement. Other than that it should be fine.
I'm not sure if I got the file format correct. If it doesn't install itsself, rename the extension to ".zip" and extract into your themes directory.