Innovative bio-based building products could become the norm for green building in the future, writes Gary Wollenhaupt. Recent winners of the Cradle to Cradle Product Innovation Challenge are a brick "made from bacterial byproducts that cement sand particles together in a matrix that's strong enough to use for homes" and insulation created from agricultural waste products that can grow within a wall. Another product in the works is bacteria-infused concrete that "fills in holes and cracks in the concrete, making it last longer and reducing maintenance costs."