Katja's hamster Fred has a home to die for, for a hamster. Katja converted an Ikea Expedit bookcase into a multi-level hamster home featuring a different room for each activity. Fred has a large room for running, stairs and ladders to traverse, a room to burrow in, a room to take a dust bath in, a room to eat in, variable lighting, and plenty of places in which to explore and play. See more pictures and find out how it was done at Pawesome. Link