I just bought a 135g and have been wondering the same. My other tank is blue but I don't know if I want to paint this one the same. There are some 3d backgrounds that I've seen...one with a pic taken pointed up, at the surface that looks nice but almost every one I've seen in person looks incredibly cheesy. It does take a specific mounting adhesive that is supposed to make it viewable from the sides as well
I'm going to order it and see how it looks without mounting it. If it looks good I'll post a pic. If it looks bad, my answer will be "blue", I guess