While Tucson has a bit of a graffiti problem in general, there are some using the University of Arizona as a canvas in more aesthetically pleasing ways, usually using stencils and a single color of spray paint.
underpass near Greek Row
staircase of the Music Building
sidewalk next to a Zone 1 parking lot
wall of the Park Student Union
sidewalk a few blocks north of campus at the Zona Verde apartment complex
staircase of the Manuel Pacheco Integrated Learning Center