Concrete Canvas

If this develops well, it'll be pretty cool.
(click around, the website looks smooth, too)
From SEED,

"Each 16 square-meter (172 square-foot) structure arrives via truck as a 225 kilogram (500 lb) bag of cement dust and fiber. The sack is filled with water and left to hydrate for 15 minutes. Then it is unfolded and inflated by activating a small chemical pack, which releases gas into the plastic lining. After 12 hours, the concrete cloth fully hardens into a sterile, usable structure with a minimum durability of 10 years. It looks like a cross between a zeppelin and an igloo..."