At the southern end of the central part of Tucson Boulevard (the part that runs between the Rillito and Aviation Highway) is this little tile mural:
It's tucked in a corner between the home at 1521 S. Tucson and the dead-end street. Behind the mural is the wall that separates Aviation Bikeway/Highway from the neighborhood.
Update (February 1, 2016): There's a bench under a tree just up the street… a nice spot to sit and relax. Click there to see it on the Tucson's Pocket Parks blog.