Hey Richapocalypse,
You’re really only limited by your imagination and time! I highly recommend watching the Blueprint tutorials here,
They’re listed Blueprints - 1… 9 near the bottom, and I’m sure more to come. There really aren’t many limits to what you can do with blueprints - sometimes things can be done more efficiently or easier using C++, but blueprints have tons of advantages. And nothing is written in stone, so if you encounter something you can’t do with Blueprints, let us know! We want to make blueprints as powerful and as simple as possible.
The Tappy Chicken sample is written entirely in Blueprints - and that’s a full game! 
Cheers,
Nick (Epic Games)