I forgot to reply, but When I originally saw the tile in the pictures, I thought you took it out of one the hotels and decorated the back side and then replaced it artwork up. That way they dont know its there and it something CEG only knows about. That way if you ever go back, you can see if its still there.
I figured you could do it at each host hotel per year.
HAHAHA that's kind of a good idea, however, I can't say I've ever been in a hotel room that had a drop ceiling.