Rhino has the green bottom from the green/blue dome topped dust house from petsmart for now, until i find him something made of metal or glass. (he doesn't chew it and it is only available for a short time during playtime)
what i do is put the dust bowl in the knee space (where a desk chair would tuck in) of the desk in my bedroom and use a cardboard box over the dust house with a doorway cut into it. yes, dust flies everywhere in that little space, and my bedroom needs the furniture dusted at least twice a week + a really good vacuuming of the floor at least once a week, but i never see dust from the blue cloud anywhere else in my apartment. Rhino only plays in the small bedroom (10' x 10') and adjoining hallway.
i have to be pretty diligent about keeping the dust levels down in my place, my daughter has allergies where some where confirmed by tests but others weren't (she wouldn't let the doctor poke her too many times), so dust is one of those allergies i'm not sure about her sensitivity level yet. i haven't seen her have any reactions to the dust or hay, so i'm hoping additional 'pokes' aren't going to be needed.
as for the black ikea chair i have in my bedroom...... that's another story! hahaha! the chair is grey more than black most of the time. it is now Rhino's chair, and i don't sit in it or put anything on it any more. thank goodness it's easy to vacuum!