hi,
most likely you have to customize yourself. i dont know a address for premium themes, in my opinion there is non. but you might look here: freebuddypressthemes.com, where daniel felice is trying to build up a place for sharing buddypressthemes.
nicolai
Hi, do you know if there is a documentation about template tags that can be used for buddypress themes?
Thank you … will check it out!
check out http://www.freebuddypressthemes.com
keep an eye on it over the next month or so 
Hi, I´m interested in making my own buddypress-home theme and buddypress-member theme, to fit my web site. I´ve been looking for information on the web, but I have not found anything good. Anyone has some kind of tutorial about it?
Alain
Well, i began working on my own theme, but not in the best way. I´m modifing the css files (by example, base.css) of the buddypress-home theme, to change the appereance of the pages. I just wanted to know if there is a tool or something that help me with this stuff. Because the API functions will not help me with my new theme (i think)
