This winter I put plastic over the windows to keep out drafts. The cat wasn't too happy about this since it meant he couldn't sit in the windows. So I made him a cat shelf. Everything's recycled except the brackets.
I started with some scap plywood, some quilt stuffing, some salvaged upholstery squares and some shelf brackets. Upholstery worked best since my cat likes to scratch the fabric.
Sew the upholstery squares together big enough to wrap over plywood. (Prana is already showing interest.)
Next staple quilt stuffing onto plywood with staple gun.
Wrap upholstery around plywood and staple underneath.
Screw brackets to bottom and to wall.
Cat tested and approved!