Here is an example of using straw bales to form a concrete house. They stack the bales where the interior will be and then cover them with concrete. Defiantly an alternative form of building but I'm unsure about how permie it is because of the use of concrete.
This isn't so different from the way a lot of old root cellars used to be constructed in this part of the world.
a hole was dug which had a lump in the middle, the desired shape of the cellar to be. Concrete was formed around it and after drying, the dirt was dug out of the middle, leaving the cavity which became the cellar.