I searched around a bit, and didn't see anything direct on the topic. Just this..
http://forum.ppcgeeks.com/showthread...t=color+clouds
I threw that in case it would interest someone. It has steps to do it manually.
Also, here is the thread with the different colors.
http://forum.xda-developers.com/showthread.php?t=599147
I don't take credit, all due to the creator. =)
I think I should mention, the ones in the thread are for Manila 2.5, there is a link for 2.1. If you install the wrong one, Sense might not start up.