We recently moved to a 4 bedroom house, and we have two kids, so our fourth bedroom isn't currently being used for anything. We made it into a guest room for the time being, but we rarely have guests stay over. I think we've only had one guest stay the night in the past 6 months, so it seems like a waste of a room to keep it as a guest room. We have a bonus room, so my kids already have a play room. Does anyone have any other ideas on what to do with the spare room? If you have a spare room, what do you use it for?