Everybody loves hammocks. Especially cats. This one happens to be one that suspends over a heat radiator, but it could be mounted to a wall or free standing.
Step 1: parts list
Similar to my other instructable on making a window cat lounge, this uses scrap sticks. I define "sticks" as any slender piece of wood, minimum 1/4" thick x 1/2" wide.
So, an approximate (because it depends on the size you want and what you can find) parts list:
2 pieces approximately 12"
2 pieces approximately 14"
2 pieces approximately 20
3 pieces approximately 18"
assorted little pieces
a piece of cloth approximately 18" x 28", preferably stretchy