Bootstrap is a powerful, feature rich, mobile first, front end framework for faster web development. There are many WordPress themes built based on this amazing framework. I want to introduce you to two WordPress themes from fabthemes.com built on Bootstrap framework. What is special about these themes? Though they look like they belong to a high dollar theme shop, they are actually free.
Zenith is a Wedding related WordPress theme. This theme is built with lots of back end options that will let you customize the content and the look and feel of the theme.
Adament is an awesome portfolio/photography wordpress theme featuring a fullscreen slideshow on the homepage. The theme has a custom portfolio page with cool jQuery goodness built into it.