Described as "architecture for a new ecology," Element House by MOS Architects is designed to be pre-fabricated, modular and run totally off the grid energy-wise. It doesn't exist yet, unfortunately. (The best ones never do.) But the Museum of Outdoor Arts in Denver, where the project is currently on display, plans to build a prototype of Element House this summer!
This would be a dream to furnish. I wonder what prototype real estate goes for these days.