I would encourage people to check out http://getskeleton.com instead of Bootstrap.

Bootstrap has a very rich design already, so it's not a great scaffold to build on top of because there's very little room for you to add flavor and customization to it without making it look like a frankenstein design.

Skeleton is really minimal, it basically just does typography, some basic form styling, and a grid system. It's a much better base to work off of and add to than Bootstrap.