Flat UI Pro is made on the basis of Twitter Bootstrap in a stunning flat-style, and the kit also includes a PSD version for designers. From $39. Learn More: http://designmodo.com/flat/
Flat UI Colors
The Flat UI HTML & CSS Kit is made on the basis of Twitter Bootstrap, a comfortable and functional framework that simplifies the development of websites. The framework has been proven over the years by developers from around the world.