Do you have any kitties?  I have three of them, and I bet they would all absolutely love one of these!  Jessi from Practically Functional used an empty box, a wire coat hanger, and a t-shirt to create this adorable recycled cat bed.  You could even add a pillow on the inside for extra comfort – though one of my cats loves sleeping on cardboard so much that he would probably prefer it without a pillow, so I guess that depends on what your own cat prefers!  [how to make a recycled t-shirt cat tent]

Project estimate:

• Box, on hand
• Wire coat hanger, on hand
• T-shirt, on hand
• Pillow, on hand or $1 and up

Total:  Free and up!