You can see a bit of a multicolored fence behind this black mailbox. (The whole fence is on the Tucson Murals Project blog in the entry titled Multicolored corner.) I'm not sure quite what the design is, but are those curved pieces of metal supposed to be insect antennae or something?
I buzzed by on May 11th.
Update (September 1, 2013): There's a clearer photo in today's entry.