Set amid the brick colonials and blocky postwar apartment buildings of Arlington's Westover neighborhood, Patty Shields's new home sticks out. The home is so angular and sleek that it appears to have jumped from the pages of a modern-living magazine. But more than looks, what sets this place apart are hidden innards, such as geothermal heating and a rainwater collection system, that make it one of few local examples of a house built green from the ground up.... Indoors, wood flooring is from sustainably harvested trees, countertops glint with pieces of recycled beer bottles, and paint gives off no noxious...