I try to make each "hundredth" post a bit special. I saved Feld Davis Park for the 500th partly because of where most of the murals are painted: on the street instead of a wall.
Feld Davis Park is at the southeast corner of 8th Street & Martin, just west of Campbell. I rode by on the morning of May 11th.
Update (November 4, 2013): There's an overall photo, and more info, in today's entry on the Tucson's Pocket Parks blog.