UPDATE 2013-08-15, this themes are no longer available, but we have many better ones at the market.
There’s a new theme for OC!
Anunciamex that it’s been released under GPL (Download) (Demo).
This theme is done by one collaborator of the forum, it is the only theme that works with fix width. Thanks!
Also I just decided to release the “premium” theme Edit_80 (Download) (Demo).
This theme have an extra feature, that allows you to change the css to the end user.
Remember, other available themes.