I've been seeing a lot of those 100 Theme Drawing Challenge lists here there and yonder, and am toying with the idea of doing one. Maybe, like, a sketch a day, to make myself be disciplined (and make sure I'm drawing for myself, too, and not just for clients)!
My goal is not to spend a lot of time laboriously perfecting a drawing, but just to get something drawn, every day. Even if it sucks. kuraku_chan will remember the guy who said you have to do about a million sucky drawings before you start doing good ones. :D