I know a few peeps that have built a straw bale house, and studio: all are compete zealots over it, and it is not a fire hazard as one might expect - the bales are usually covered (with fire-******ant materials) with your choice of materials, and if you're in a temperate climate, can be great for extreme hot, or cold weather, as it's RF equivalent shields the dwelling from the elements extremely well...
I've been wanting to build a place out of 'cobb' - an ancient building material that's very 'clay-like', and can be designed into virtually any shape, as it is a soft medium that can be formed. As a structure, it can be as 'wild' looking as your imagination. Better option for moderate and dry(er) climates, tho in many places, cobb structures are still standing and functioning after centuries (scotland, etc)
best with it!