Dan Phillips of Huntsville has been building houses from recycled material for years. His projects include the Phoenix Commotion and Brigid's Paradigm. His houses are affordable well beyond the government's definition.
While many people have gone down to the local Habitat for Humanity Restore to buy an item or two for a renovation project, Dan has made an art of taking discarded materials and turning them into whole houses. His houses aren't just simple structures either. They are works of practical art.
You can see a number of video's about his work on the Phoenix Commotion site, but one of the best I've seen is from the Texas Country Reporter and is below.
On June 12, 2010 Dan spoke at TEDx Houston. Here is his talk which gives insight into his philosophy.