We made a compost bin our of hollow blocks. We just surrounded with hollow blocks the soil by the side of our house. The 2 feet by 2 feet that looks like a planter box is our informal compost bin where we throw leftover vegetables, fruits and any other biodegradable materials. But before I forget, we searched for big earthworms and placed them in the compost bin because those earthworms are the processors that hastens the production of compost. For those with no extra land, a wooden box can be your compost bin. Just fill it with 1 foot of soil and earthworms, of course. And the best if a wooden box with a cover.