Cob homes are making a revivial from the olden days. Made out of clay, sand, straw, water and earth, they are similar to the adobe style homes of the South West United States. The come back for these types of homes can be directly attributed to the green movement. Building green saves you money and some of the homes are actually built with recyclable materials as well, so save the environment on a larger scale. I believe this is really the way of the future, by going back to the basics.