Humble murals are okay here! (Right, Randy??) And these murals -- at the northwest corner of the bridge across the Silvercroft Wash, near 1700 West Speedway -- have some creative tricks. Those raindrops under the cloud on the left side, for instance, cover what look to me like plugged holes in the concrete.
I do most of my mural-hunting on a bicycle. That makes it easier to spot art in places that aren't so obvious (and is a fun way to get some exercise, too).