I have both the Reflex Color Zen and the Tickled Pink Zen themes from Bplay running on my Tour. Although they aren't ground shattering new themes, they give me some variety from the stock themes (that are EXACTLY the same I might add).
The themes work seamlessly on the Tour. Reflex offers some nice icons and Tickled Pink appeals to my "girlie" side. They were both $4.99 I believe.
It was worth the nine bucks considering it may be a while before other themes are developed.
BlackBerry9630/188.8.131.52 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/105