I think you'll have a hard time starting a new "real" project with Angular 2 as it currently stands. The lack of UI framework is only the first hurdle - other important libraries and frameworks will also be missing. Angular 2 is very much still "subject to change"... so any code you write today probably won't work as-is on the final release version. This lack of stability is probably what's keeping people from creating many libraries at this point.
I found this: Angular 2 Bootstrap. It's the 2nd hit on google for "angular 2 bootstrap". It only has 15 stars on Github. I don't think you want to build a production app around that yet ;)