There are a couple of things I’ve drawn that I’ve been tempted to do something with, but I never actually have. Mostly because I suspect it’d turn into long-ass stuff that I’d never finish. XD Likewise, there are a few things I could probably draw, but it’s just more fun to draw things for other people. ^_^ (Though I just might break down and art something from Odalisque or Barrow Wight at some point.)
I think that mostly, it’s just easier to get excited about somebody else’s work. It’s fresh, you know? You don’t already know it inside and out.