Keep one in the shower filled with a mixture of half vinegar and half Dawn dishsoap. Use it to wipe down the shower while you are in there and your shower will always be clean.....This is THE magic formula!
Glue old book spines to a box for hidden storage. Leave the front cover on one of the books and the back cover on another to use as the sides of your box. This would be perfect for spare remotes, cables, router, or anything else you wish to keep out of site but accessible.