Photos: Living walls, smart homes at West Coast Green

The Rainwater Hog can hold 48 gallons of water for reuse around a household, including in gardens and in toilets. The slim modules are built to squeeze along walls, under decks, and in other tight spots where rain-harvesting barrels won't fit. The product is made from recyclable polyethylene plastic. The company was founded in Australia, which faces an ongoing water shortage.

Photo by Elsa Wenzel/CNET

Caption by Elsa Wenzel