I've always known too many words for my own good. But of late, I've been feeling as if I'm forgetting some, or as if I'm out of practice in using them. Solution: Hit the SAT books, which are full of words I know are part of my vocabulary. And instead of rote memorization, which I don't need, I'll just doodle them to refresh.
These are all quick hand sketches (under 30min) cleaned up in Illustrator. (Naturally, it took me at least three times as long to clean them up as it did to sketch them in the first place.)