You can create con files. But you cannot get custom themes without editing one that is already made. This has been proven. Ever since microsoft can detect what theme you are running(from sweep stakes) they have indexed all of there themes.
In other news, I have made a public sample theme: http://www.sendspace.com/file/hss4e2
And a picture proving they work: http://aquate.us/u/uvs0906.BMP
Edited by gabe_k, 03 June 2009 - 09:43 PM.