Austin Kleon:

Creative people need time to just sit around and do nothing.  I get some of my best ideas when I'm bored, which is why I never take my shirts to the cleaners.  I love ironing my shirts -- it's so boring, I almost always get good ideas.  If you're out of ideas, wash the dishes.  Take a really long walk.  Stare at a spot on the wall for as long as you can.

Steal Like an Artist, p. 67