The Twitter Bootstrap Themer.
With a few clicks you can customize most of the options and even some that aren’t on the official customizer (like the background image in the Hero Unit above).
Want to see a demo? This page is done with it!
Actually, Bootswatcher is part of a bigger project called Dezmin, which is due to lauch in December 2012 and it’s developed by the Dezmin Team.
It’s aimed for use by designers and developers that are already using or plan to use the awesome Twitter Bootstrap and want to be able to quickly customize it.