Remove a cabinet door panel and add a curtain with a tension rod to hide a litter box. Would be great in a laundry or mud room. Could also see if there's a way to add an actual cat door, to cut down on litter tracking.
Nightstand Dog Bed – An old flea-market dresser into a combination bedside table and pet bed. DIY Network has more unique ideas and instructions on how to make dog and cat beds from old end tables, dressers and more.