Bootswatch is a collection of free themes for Twitter Bootstrap.

Check out their Premium Bootstrap Themes.

EasyTo Install
Simply download a CSS file and replace the one in Bootstrap. No messing around with hex values.

Open Source
Bootstrap themes are released under the MIT License and maintained by the community on GitHub.

Modular
Changes are contained in just two LESS or SASS files, enabling modification and ensuring forward compatibility.

Preview any ready-made theme and download the theme of your choice FREE.