You can also load other themes built here and on xda for added enjoyment. See this link for over a 100 pages to entertain you for awhile. Its been awhile but from what I remember you have to extract the files into the appropriate spb file and reboot to get them to work. They are fun.
http://forum.xda-developers.com/showthread.php?t=380103
If that doesnt entertain you for 15 days then switch to another theme like this one:
http://forum.ppcgeeks.com/showthread...=11507&page=52
Then play around with md2:
http://forum.xda-developers.com/showthread.php?t=430325
and there's more behind door #3>>>
have fun!