Earthbag houses are great. Very solid, easy to build and cheap. A great solution for green people with small pockets.
Eating a fancy diner in a tree. Thanks to the Yellow Treehouse Restaurant created by Pacific Environments Architects Ltd. (PEL) it’s possible. The tree-restaurant has a pod-like structure, it looks a bit like a cocoon or onion in a tree. I think it looks great, especially after dark.
More photos and info here