Recently I built a theme for the Lemonstand Ecommerce software using Bootstrap as a base. It is meant as a quick start for developers to get going and as a good theme for beginners to learn the system with (still working on the docs.) http://lemonstand.com/marketplace/theme/bootstrap/ is the link for Marketplace where it is hosted (free) which also has links to the GitHub page for full source.

I also tried to keep it as base-bootstrap as possible for easier adoption.