I am a big fan (and used to be a big user) of Sketchup, the easy-to-use drawing software that Google now gives away. They teamed up with Dwell Magazine run a design competition encouraging designers to "think about your idea of a comfortable and sustainable dwelling, and to share it with the world."
The winner is Drew Wilgus, whose entry "stood out for its sustainable elements, integration into the local landscape, keen material use, and striking aesthetic."
"Constructed using salvaged bridge elements, the home references the nearby Golden Gate while taking advantage of green building practices. Reclaimed redwood and steel materials marry the surrounding wilderness with the built environment. A landscaped plinth dug out beneath the house provides parking and channels wind through a series of turbines, alluding to the site’s previous life as an airfield."
See more images at ::Dwell via ::Jetson Green
You can see all the runners-up (like this one by Stephen Cheung) ::at Sketchup
More on Sketchup and Green Design
SketchUp Goes Green
Google Sketchup Sponsors Sportables Challenge
Marketing Design: Green Modern Prefab Meets Google