Here are some cool earthen homes that use a creative mixture of ingredients and style. This is the kind of stuff that gets my imagination going.
This one was build by Gary Zuker in the Texas hill country outside of Austin.
Here is a neat combination straw, cob, stone, wood, etc. being built in NM by Clay and Straw.
And here is my favorite. This one was built by Simon Dale in Wales.
There are endless possibilities. If you have some great examples of creative use of materials in homebuilding let me see ’em.