I love this idea - I no longer like using Twitter Bootstrap because it's just so huge! And 90% of the time I find myself creating an override file to style it to my websites feel.
I do love their grid system though, does anyone know of a great lightweight grid system that's robust like Bootstrap's?
Edit: when I originally posted this, it was a fork of https://github.com/aekaplan/grid -- which I did not write (tried to express that via "when I first saw it", but in hindsight was not clear). I've since changed it at the original author's request. Apologies for any confusion!
Not only should you be overriding stuff, but nowadays they include the LESS files (with Bower at least) so in essence you can pick and/or rewrite the parts you want.
The complaint that Bootstrap is so huge is no longer valid, people are just super lazy.
That's my take as well... imho, you should be using bootstrap from the source... I usually start with the source, copy the mixins and variables files, and then create a new main less file that references all the parts I need with my copy of mixins/vars... works out really well, and less need to worry about new versions.
I've used http://weice.in/ivory/index.html before and liked it. However, I don't do much web-design, so I can't really comment on how good or bad it is, just that I've found it useful in the past.
I do love their grid system though, does anyone know of a great lightweight grid system that's robust like Bootstrap's?