Then, just recently, there’s this another gift to the Bootstrap community: @designmodo’s Flat-UI Free. Its a User Interface Kit / Theme for Bootstrap that is, as of 2012-2013, is hip and stylish given the trend on an alternative “flatter” UI design (e.g. Windows 8, Google+).
Now, my search yields empty in finding a comprehensive demo of Flat-UI Kit. So I’ve hacked together a quick demonstration by applying the Flat-UI css and js markup to the stock Bootstrap 2.x documentation.
Below you’ll see the comparison between stock Bootstrap (blue button) vs. with Flat-UI styles applied (green button).