There are a TON of different designs, some are "dig into the ground" others involve rocks, etc.. All for back packers and campers. Then people started taking those ideas and then domesticating them. This is one of my favorites. Its simple easy to assemble and store outside the house and then easy to put together and use if you need it.
But this is also and idea one can take to the extreems... Somewhere out there I saw a guys with a six burner job made out of cinder blocks. Simple or exotic, your choice.