DIY herb gardens. Cut the soda bottle or any plastic bottle with a cover. Turn upside down; attach to board. I'm thinking of leaving the cover to the bottle on; punch in a few holes to drain excess water, but not have the soil drain out also.
Hanging garden. It's very difficult to grow organic food along the ocean due to all of the salt and sandy property. Almost impossible to have a garden in the earth. This is perfect for fresh ingredients.