Minimalist IKEA Cabinet Hack, and lots of other ideas on hiding a litter box. Not just for the litter box but for a dog's or cat's pet bed, when company is over or just during the day, just shut the door and it won't have to be seen until bedtime.
Wall Trellis Kit : Use silicone glue to bond a number of anchors to a wall or window. Next, string the wire from anchor to anchor to create a frame. Finally, use the vinyl tape to support plants on the newly created trellis.