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.
Hammock bed - this gave me an idea. wouldnt it be fun (if i was rich) to have a huge kids playroom with a built in indoor trampoline for the kids to jump! (kinda like where this hammock is- floor level- but tramp! I want this one day :)