Here is the Solar Decathlon 2009 entry from Cornell University.

The Silo House:

consists of three cylinder-shaped modules that interconnect

According to one of the students:

You're not going to see another house like this on the mall...This is our third competition, and we were tired of doing boxes. We decided to do a whole new take on modularity."

Interesting to note: "With more than 150 members, the Cornell team is the largest student-run project on campus -- a point of pride."

Their Silo House Web site is coming soon.