Small enslosed playpens?

Anyone have ideas for a very small enclosed playpen? I dont actually want it for them to play in. There whole room is built to let them run around. But i wanted to try giving them there dust baths outside of the cage now to avoid the mass dust mess inside. But, naturally, when they came out tonight they were rly only concerned in exploring. (granted it was there first time out in this new room.) But still, id like to have a small enclosure that i could let them into. Where theirs rly only room for them to focus on a dust bath.



And suggestions?