More ideas from wha
You eventually smooth out the walls  - -see a breakdown of the cost to build one cob house - about $2500 at http://greenbuildingelements.com/2011/05/09/the-year-of-the-mud-documents-green-home-building-with-cob/

The Year of the Mud: Building a Cob House Documents Green Home Building with Cob - Green Building Elements

Wood Fired Native Clay Vessel by firebugpotter on Etsy

Wood Fired Native Clay Vessel by firebugpotter, Jayme Allen