More to explore:
Recycle it. Earthships do! New Mexico Taos sustainable earthship
Taos, New Mexico
Earthship in Taos, New Mexico. The black "dots" are glass bottles.
Pink Earth Ship, Taos, New Mexico
Michael Reynolds' Earthships turn junk into building materials
Earthship Tire Wall by Earthworm, via Flickr. Great insulation when filled with rammed earth.