I just saw a great new theme on BlackBerryforums by Styrizo which has a nice clean cut style for the BlackBerry 8100. I love the simplistic design and the very clear white on black styling. Personally the Bluetooth icon could use some work but otherwise I think the designer has some real style. The whole theme is very mellow and looked great on our test 8100.
Sadly there are no OTA links but the Desktop Manager files can be picked up at the following link. Nice job Styrizo!