Here is the latest theme that WordPress have added it into its directory on March 31 and the name of this theme is “The Bootstrap” and this theme is simple and clean.
A WordPress Theme based on Bootstrap, from Twitter. It features a 100% responsive layout, a superb gallery and image handling, a clean and simple design and a lot more!
This theme has some descent features like black, blue, custom-background, custom-menu, flexible-width, light, microformats, post-formats, right sidebar, threaded-comments, translation-ready, two columns and White.
Download this theme for free here