Self-watering planter made from old pop bottles...Cut the top third off a two-liter plastic bottle. Ask an adult to drill a small hole in the cap. Pass a string through the hole. Fill the bottom of the bottle about half way with water. Place the top upside-down in the bottom and put in your plant. The string will wick up the water into the soil.
Trying to grow tomatoes and not too satisfied with how your plants are turning out? Here are some tips: http://hubpages.com/living/12-tips-for-growing-better-tomatoes
DIY seed pots that can be made from items you probably have in your recycle bin right now.
10 Steps to Get 50-80 Pounds of Tomatoes from Every Plant You Grow. Revealed: The Secret to Growing Juicy, Tasty, High-Yield Tomatoes