For hot composting you must have at least a cube of one yard to get it to heat up and kill weed seeds and bacteria. So any contraption that will hold this volume conveniently will do. You can use recycled straw bales, recycled builders wooden palletes, or anything else that will retain the right shape.

For cold composting you can use a recycled 44 gallon oil drum with the top cut out, and a six-inch hole in the bottom. Support the drum on recycled bricks so that you can slide a recycled ice-cream container under the hole to collect what drops out.

Cover the hole with a wire grill such as the tray from a recycled oven and start adding food scraps. When the scraps are about 6 inches deep, add worms. You can buy manure worms, or look under piles of dead leaves. This is better for small quantities, and you rely on the earthworms to do the work for you.