In case your cat happens to be a Super Mario fan, you can make a super Chain Chomp monster bed for your pet. Guys behind the furniture maker Catastrophicreations have created a cool cat furniture from large foam balls coated with epoxy resin. The bed is connected to the box with a chain and it has hidden hinges for using as storage of cat items. This page highlights different steps on how this cool bed was made. You may navigate through the page for making a similar cat bed for your pet cats.
More info: Etsy | catastrophicreations.com ( h/t: boredpanda )