You said you wanted crazy.
Move your compost bin into the garage and let the heat warm your garage.
One of the earth ships that I saw in a magazine as a kid had water drums in the wall. During the day, the outer wall was tilted down. The outer wall had foil on the inside of the insulation. The sun reflected off of the tilted wall and heated the water drums. At night the wall was closed and the thermal mass of the water kept the house warm.
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