I’ve been thinking about building a rocket stove and/or earth oven. The rocket stoves seem to make good use of small branches that might otherwise end up in a landfill. And why not keep heat from cooking outside during the summer instead of using electricity to heat the stovetop and then run the air conditioner to cool down the house?
Here’s a unique idea on the instructables site for a tandoor oven (tandoori oven) made from a garbage can and a clay flowerpot. Check it out.