This is great, I'd recommend pairing it with Bootsnipp [1]. It seems pretty feasible to almost create your own custom theme out of StartBootstrap, BootSnipp and a few other items from the Big Badass List [2] by just cut-n-paste - but I wish there were a "real" cross project build system.

1 - http://www.bootsnipp.com/ 2 - http://www.bootstraphero.com/the-big-badass-list-of-twitter-...