There are quite many WP-themes with Bootstrap already included, easy to search at http://wordpress.org/themes/search.php?q=%22Bootstrap+3%22 or similiar.
I did little Googling and found this http://shoestrap.org/
I have not tested it, but it looks quite nice!
Features Organized file and template structure HTML5 Boilerplate's markup along with ARIA roles and microformat Bootstrap Grunt build script Theme activation Theme wrapper Root relative URLs Cleaner HTML output of navigation menus Cleaner output of wp_head and enqueued scripts/styles Nice search (/search/query/) Image captions use <figure> and <figcaption> Example vCard widget Posts use the hNews microformat Multilingual ready (Brazilian Portuguese, Bulgarian, Catalan, Danish, Dutch, English, Finnish, French, German, Hungarian, Indonesian, Italian, Korean, Macedonian, Norwegian, Polish, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese, Turkish, Vietnamese, Serbian)
Also GitHub link https://github.com/shoestrap/shoestrap-3