From:
www.rockettheme.com/forum/index.php?f=61..._v=viewtopic#p796853
1. You can override the RokSprocket layout files and css by setting up a new directory inside your template folder named /roksprocket. Follow the directory structure that matches the roksprocket component. An example of an override for lists would be:
/roksprocket/layouts/lists/themes/default/
If you copy the index.php and lists.css from the component into this directory and make your modifications, RokSprocket will use these template override files rather than the core roksprocket ones.