Actually, folks, it's not a mural of monsters... it's a very large mural. Artist Susan Kay Johnson (who also founded Tucson's All Souls Procession, along with many other artistic feats) painted this ginormous mural along an entire block on 9th Avenue, south of University Blvd., in the Dunbar/Spring Neighborhood. The mural has a procession of scenes; walk along the block (yes, it's at least a block long!) and enjoy it all. My cell phone camera couldn't capture more than small pieces of the whole thing. Maybe this is the excuse I need to finally buy a wide-angle lens for my other camera. ;-)
Update (April 18, 2013): I've just posted a photo of a recent addition above the mural.
Update (October 1, 2014): A photo of artist Sue Johnson just as the mural had been painted is in the Tucson Citizen archives on April 20, 2007 at Mural honors neighborhood.