I'm running a basic black theme these days. This is based on the latest iteration of Mighty ROM.
-The vista orb icon in the Start menu and the black flip clock are built into Mighty ROM.
-The line at the top of the window is the Vista hide battery icon.
-The other custom icons in the taskbar can be found in this thread:
http://forum.ppcgeeks.com/showthread.php?t=44293
-I replaced the standard TouchFlo 3D icons with iphone style ones found in a thread at xda forums.
-On the programs screen I removed the background buttons from behind the program icons.