So in my opinion you're asking the wrong question, the right question is: "How do I make my Bootstrap site not FEEL like every single other Bootstrap site on the internet?"
If you're willing to pay for high quality third party themes it is definitely possible to get something that nobody would call a Bootstrap powered site unless they happened to look at the raw code.
Just don't throw the baby out with the bathwater when all you really want is to look fresh, original, and on-point. It can be done with Bootstrap.
Sample layouts look great, thanks for posting. Long live "unopinionated" frameworks.
It's pretty complete and is constantly updated -- and besides including a battle-tested JS library of its own, it is evolving toward eschewing some of the "usual" dependencies.
One of the key reasons I use it outside work is that it targets _generic_ sites and can be customized and/or pulled in piecemeal if you take the time to build your own version.
The new beta (http://beta.semantic-ui.com/) version looks really promising as well, it's made to work with themes but it's a different way of working than the previous version. You get more control in building from less.
That said, if you're going to use base bootstrap with no customizations for your project documentation or something like that, more power to you...
On the lighter side (codebase wise) getskeleton.com is useful. It handles the responsive stuff without adding much other styling.
Google recently put out Web Starter kit as well: developers.google.com/web/starter-kit/
Would definitely recommend Foundation in a heartbeat.
http://bourbon.io/ http://neat.bourbon.io/ http://bitters.bourbon.io/ http://refills.bourbon.io/
Zimit
InK
HTML KickStart
Kickstrap
Pure