Here's a billboard wall ad I made for one of my buildings. The photo was scanned, lettering was added, and the image was printed onto SuperCal decal paper with an inkjet printer. Since the decal film is clear, I had to paint a white rectangle on the wall where the image was to go. The picture shows my wife and grandson (whose surname is Cluff).
Cool idea, I have in the past pealed the stickers off my soda and over 21 beverages and put them into the sides of my buildings.