My grandfather grew up in one of these in the Andes Mountains of Venezuela. I hear the little casita still stands today but there are no roads that go to it, we’d have to hike 1/2 a day to get there. When I came across a post on Apartment Therapy about earth casitas, my desire to take that hike was re-awakened. In the meantime, I’ll read about this natural method of construction and check out pictures on the internet. If you’re interested in learning more check out http://www.cobcottage.com, they provide pictures of English structures and methods.
A good site for Adobe Houses: http://www.adobebuilder.com