Guinea pig cage that was a TV unit in a former life. A ramp connects the 2 levels and there is a sheltered sleeping area plus lots of storage. The guinea pigs' favourite spot to sit is right in the middle of the ramp. Typical!:
I am starting this for Winnie.. use organizer cubes as walls for a rabbit habitat. Hold walls together and carpet/grass to the floor with zip ties. Use a shower liner around the bottom to protect flooring.