I have an acrylic display case for my Jack Sparrow DX. Had already thought about printing either a Caribbean beach scene or some kind of dark eerie background from the black pearl to put on the back of the case.
a youtube channel from some guy called drakstoys shows his collection. He has custom printed backdrops for each shelf. Looks damn amazing! Too bad I'm just too lazy to do the same!!
I have the Ikea Besta/Framsta display with the light panels. I tried printing a backdrop on a translucent film to put in front of the light panel. If I could get a hi-res enough source file it might look decent. A lot of work though.