When I was growing up I watched documentary on building with bricks made with mud and grass. So, unknown to my Father, I started making my own bricks and building a room. I was building the room to be about 8 by 10 feet with one door. I built it up to about 2 or 2 1/2 feet high before I lost interest and started on another project. My Father didn't come across it on his property until I was grown and gone. I remember getting the phone call from him asking me if I knew anything about this strange mud like brick thing. I explained that I made it and I apologized for not telling him. He wanted to know how I made it because he couldn't tear it down. It was too strong. He eventually had to rent a bull dozer to tear it up. I explained that used old pans in which I mixed mud and grass to form a brick. I would let it dry a bit and turn it out of the pan to let them bake in the sun. Then I would build the walls with my bricks using more mud mixed with grass to hold the bricks together.
This Cobb house is along the same lines but different. They used mud, sand and grass. But I don't think they made bricks with it.