After having played piano for a long time, I haven't played that much since grade 11 or 12. However, I have recently gone back to it with a new attitude. I have been also learning guitar. When I play guitar, I usually just make stuff up and it works pretty well. So I've been doing the same thing with piano.
What I've also found is that I don't really care that much if it sounds "good". I'm more interested in just the different types of stuff I can do.