Here we have some good news. If you really into Bootstrap and you want to style it differently or theme it - we have free solution. Introducing BlackTie, where you can get free bootstrap themes, and they don't look cheap; they are as high quality as the premium stuff.
There are total of 13 free themes at the moment, and all of them are using Bootstrap version 3. Check these screenshots, and I'm pretty sure you'll head over there soon :)