Because my friend Matt asked me this the other night, I had to think about it. His is painting a blue sky and some clouds, then he waits to see if anything more comes. His skull for Skull Appreciation Day was just the blue sky & clouds cause nothing else came to him. Well, I thought about it and decided that my default is: a piece of colored paper, a letter or number, and a circle or lately, some Washi tape. No droughts with a default. So what's yours? see Matt's work here.