Various plants that you can regrow from the food
Apples- http://www.ehow.com/
Tomatoes- http://www.ehow.com/
Potatoes/Sweet Potatoes- http://
Green Onions- http://www.17apart.com/
http://tipnut.com/
Leeks- same technique as green onions
Carrot Tops- http://
Pineapple- http://
Romaine Lettuce- Same technique as celery
Cabbage- Same technique as celery
Celery- http://www.17apart.com/
Avocado -http://
Lentils- http://
Pumpkin- http://pinterest.com/pin/
Ginger- http://www.gardenswag.com/
Garlic- http://www.gardenswag.com/