I call it "The Urge". It's just something I've always done, and always will do, probably. I liken it to other base needs, frankly. The longer I go without playing, like with eating, water or ......, the more I crave it.
As far as fresh ideas, I suppose I'm naturally opposed to knowingly re-using my & other people's ideas. I don't believe that their is nothing new under the sun, frankly. That belief is reason enough to keep me going...