We love Instructables! Here’s a Do It Yourself project for a cat hammock. The tutorial shows the hammock placed over a radiator (which cats would think divine!), but you could also attach it to a wall. The tutorial says it could be freestanding, but I’m not sure it won’t tip over if a cat jumped onto it. If you want it freestanding, I think I might make the stand about 6 inches tall rather than 20 inches. Also, instead of stitching the hamock onto the frame, I would use velcro so it could be removed to wash. And you could paint the frame to make it fun.