Hidden kitty litter. 1. If you don't use the cabinet under the sink in an extra bathroom, then this is a perfect space. 2. Cut a whole on the side, which won't be visible. 3. Have husband (lol) "fancy" it up by adding molding. 4. Add welcome mat to help kitty clean paws. 5. Add your litter box and BAM, you have a clean, cozy kitty condo!