The project comes with a heap of customization options and a full complement of Less files which compile down to CSS. If you haven’t checked out Less, you really ought to as it makes CSS dev much saner.
I have set-up a lab page for experiments, tests, projects-that-are-not-quite-done and my foray into game development. The Caffeine lab is built with Twitter bootstrap and is definitely a work in progress.
Check it out: sadly this had to be removed :(