In May, 2010, I spotted a faded mural on the south wall of the Family Resource & Wellness Center, at Michigan Drive just west of 13th Avenue. But (maybe because the gate into the schoolyard behind was locked?), I didn't check the north side of the building:
This view is from two months ago: May, 2011. This mural on the north wall is behind an area covered by a canopy.
As Martín Moreno pointed out to me while he was re-painting the south wall of the La Pilita Museum, murals on the south sides of buildings face the worst sun and fade the fastest. That's probably why this north-side mural is in much better shape than the one on the south side.