Tiles
It is never a good thing when the inside of your bathroom looks like a subway station. Although this look can be cool and considered hip, it has since been outdated and lost its hipster appeal. Now it just reminds us of the inside of a bathroom at a local dive bar.
To add to that, tiles can crack very easily and if you break one in this room filled with tiles, you may have a problem. If you can not find the same tile you might have to redo the entire bathroom or just have one tile that is different from the rest. This could continue until you have a lot of mismatching ones.