For a no-fuss fire pit that's easy on the eyes and easy to maintain, look no further. All you'll need is some concrete and large mixing bowls. Canisters of gel fuel supply the fire, so no wood is necessary, and you’ll have no ash clean-up after you’ve toasted marshmallows. You control the size by your choice of bowls for the mold. So, make it as small or large as you like.