Buy a 15 gallon wash pail from Lowe's. Get four bricks, Put the bricks inside the pail. Spread them out flat, to cover the bottom of the pail, and then set your logs on top of the bricks. This allows for airflow under your logs to keep the fire going.
This very balanced, aesthetically pleasing design (above) is the Autumn Sunset Leaf Fire Pit Sphere by Melissa Crisp. This unique artisan fire bowl is 37 inches in diameter and can be a great patio centerpiece even without the fire.