When I saw the promo video for Tilt-Brush, a lot of ideas crossed my mind, but I could only articulate one word: WOW.
I love painting, and I love 3D: the mix of both is just... impressive! I'm not still into Virtual Reality, and these "head-sets" are expensive (and honestly, I still don't trust them: I don't think it's healthy to place a screen right in front of your eyes), but this is one of the reasons I would love to try it.
This might be the future! Imagine walking around a forest that you just painted. And this led me to think: what about 3D modeling/animation with the same premise? We'll see ;P