I've just released an open source theme which has become a community project: Its a microstock image selling theme. Its as free and open source as wordpress. Not marketed. It works great, performs its functions, and doesn't look too bad either.
While it has lots of supporters, very few developers are involved (I simply haven't publicized it enough during the initial creation.
See the community here: http://www.microstockgroup.com/symbiostock/
Feel free to download and test it:
If your a developer and would like to get involved, it would be exciting to have you. Lots of people in the hatchling Symbiostock community could use your experience/help.