While I do have a bike rack in it, my garage is otherwise nondescript. But I could stretch a "photo tarpaulin" printed with a jet fighter over the garage door. That'd spice things up!
Thomas Sassenbach can make you a garage filled with the kind of fictional contents you specify. And he advertises his false doors as being indestructible, as well as being easy to install and change. (I think I'd like something like the above shot, but showing a stop on Portland's light rail system...)