You can try to go to the crackberry media area (themes) and ask for one, some folks do requests. I am not sure if places like themes4bb.com or pimpmyberry.com have any but it is worth a look..
I have a Curve 3300 and I got my Bama wallpaper (if that's the same as a "theme") at myxer.com They have a few and mine was free....But I got my "Yea Alabama" ringtone here!