"Recycled materials" used to mean off-white notebook paper and purses made from soda pop tops. But as we celebrate the 40th anniversary of Earth Day, recycled materials are infinitely more versatile. Nor does eco have to mean hippie. I've rounded up a wide range of home accents made from recycled materials, from plastic bottles to scaffolding to Japanese yen, that would be at home in any chic, modern home. So celebrate Earth Day and expand your eco collection.