I made my fur-enabled companions a pet bed using only recycled materials.
Here's the headboard, made with glass pieces from the crafts section of a dollar store, tile grout and a piece of scrap wood:
The bed and the mattress with removeable cover, made from a pillow and black fabric from a vintage jacket. The base is the top part of a small 1960's wood and laminate table top which means it's low to the ground and easy for the pets to access. I still have to make sheets and a comforter for it, but the cat has already made himself comfortable. He's looks angry because the flash woke his furry butt up.