Billboard Earthbag Project
This project is intended to reuse PVC that makes up the images on billboards and make them into houses for disaster and poverty stricken people. While the images are definitely cg mockups, the concept is awesome. I've personally been working on disaster relief shelters, but my concepts all involve using fresh PVC pipe. These guys have taken it a step further by taking vinyl sign material that is headed for landfills and recycling it into homes.