Last summer we had to replace the plumbing behind the tub, the shower diverter. No way to get to it without breaking the tile to fix. We have been putting off fixing the tile since could not find any matching, have bought multiple boxes of unmatching and trying to figure out how to do it, dread of tiling in general, etc, so have made do with really unattractive plastic in front of faucet piping, like a museum exhibit of home plumbing pipes.
then it occurred to me--why not put one of those tin ceiling tiles on top of where it is broken, thus keeping access in future to plumbing by a simple remove.
Then, when we went to look for the ceiling tile, found a new product intended for kitchen backsplashes, which is waterproof and very easy to work with--bought one tile for 20 dollars, and husband fixed it in about two hours: