The themes are kinda limited, but some good ones would be Optical, IIDX 15, DDR 5th mix, and Ultralight (this one's pretty plain though).
I believe there's a IIDX 18 theme being worked on as well; don't know when it'll be finished though.
F4LL3N wrote:I thought I saw somebody using a ported ITG3 theme for SM5. I could be wrong, though. Any help would be greatly appreciated.
freem's working on it and there is a pre-beta available, but it's still pretty buggy.
On that note I really should start porting some 3.9 themes over to Sm5. I keep saying I'll do it but I never do.