Well, Bootstrap designs are awesome as it is very easy to use, Less coding and faster than any other framework . Bootstrap themes and templates are big deal. So, I listed best bootstrap themes and templates provides websites here to make your design easier :
WrapBootstrap is a marketplace where designers can sell their own themes and templates based on the Twitter Bootstrap framework.
Themeforest is very popular for premium WordPress themes. Now it have also got some good quality premium bootstrap themes for business,blogs,magazines,corporate,portfolio.
Templatemonster have huge collection of business,corporate,fashion,portfolio,blogs.
Bootstrapstyler offers good free collection of downloadable bootstrap themes.