I was just talking to a friend at lunch and he mentioned that he had read about something similar to earth bag domes except that the entire dome was fired and glazed to produce what is essentially a giant clay pot. While the result is appealing, it seems like it may be a lot more work than I am ready to do at the moment. Still, something worth thinking about.
I was not able to find much information but it looks like the same guy that pioneered most of the earth bag stuff Nader Khalili is the same guy that is trying to set them on fire. Below are a few links I found (let me know if there are better ones).