Penny Floor - don't know if I would have the patience for a whole floor. but a coffee or patio table would be nice! Also an easier way to do it is to put out the pennies then flatten then by, I don't know, maybe a broom or some thing.
For the laundry room. Too obviously hangers for me, but could be a good base for flowers, fabric, etc. "Look close - those are plastic hangers! This would make a great durable outdoor decoration. via Craft Gossip"