It's easy to tweak the Bootstrap defaults, but trying to keep things as cohesive as the defaults can lead you down the rabbit hole of dependencies. BS 2.0 is a big step up, but I've found that playing only with the values in variables.less doesn't cut it quite yet.

I've tried to hit a sweet spot with Bootswatch (http://bootswatch.com), keeping it a quick-start solution for hackers while adding variety to the defaults.