I've heard you can grow potatoes in a bucket. You start with the soil fairly shallow, and add some as the potato plant grows.

As container kits, I've seen herbs, tomatoes, and strawberries.

http://www.burpee.com/ might give you some ideas if you feel like poking around there. I've been joking for a couple of years that I'm going to do a radioactivity garden, and I think this year I might actually get up and do it.