QR graffiti is an exploration of colorful temporary transformations of architecture in urban environments. Observant passersby willing to stray from their paths are rewarded with unexpected light paintings visible via QR codes. The paintings are created at night and captured with long exposure photography. So far, there have been codes scattered throughout the Texas A&M campus and nearby downtown Bryan; Reno, NV; and New York, NY. Each code links to a randomly selected light painting created in that location.