In 2.1, homepage configuration page in the appearance menu, the screenshots there are of a very nice looking theme that I am unfamiliar with. Does anyone know what theme this is?
It's the Bootstrap theme by the Vanilla team - it's currently only available for the hosted plan though.
Kasper Kronborg Isager (kasperisager) | Freelance Developer @Vanilla | Hit me up: Google Mail or Vanilla Mail | Find me on GitHub
Do you know of any sites using that theme?
Not yet no. If you'd like a Bootstrap theme, you can download the one I've made - I'm rather proud to say that this was the inspiration for the Bootstrap theme created by the Vanilla team :-) Mine is currently for 2.0 only though, I'm working on a new veisson for 2.1.