Many of the more futuristic looking ones are not just designed to be "green" but also to demonstrate new construction techniques. My personally favorite is the

Many of the more futuristic looking ones are not just designed to be "green" but also to demonstrate new construction techniques. My personally favorite is the FabLab House http://www.fablabhouse.com/en/ http://www.fablabhouse.com/en/ which is very "green" (passive cooling, good roof designed for efficient use of solar, etc) but also demonstrates building houses from wood shaped with CNC machines.