Back on April 21, I posted the first three of this "maybe a mural" series. (If you missed them, you can go to the April posts and scroll down a bit.) Here's another example. I might call it a doodle instead of a mural: smoke-like curls and a business name. It's on Hoff, at the southwest corner with 7th Street.
(Update: I rode by here again on October 19, 2010. The wall is covered with white paint.)