Barraza-Aviation (the quick route from Davis-Monthan to downtown) is decorated with murals here and there along its north-side wall — by the highway as well as the bikeway on the other side of the wall. If you're buzzing along in a car, though, you'd better look fast! (Riding a bike, or parking near an exit and walking a bit, will give you a better chance to see the murals.)
These three murals are some of the best-hidden (along with the trashed murals at the 22nd Street junction). They're on the highway side just west of the junction with 34th Street. I took the photos on July 27, 2011.