You can grow plenty of food and plants in PVC gutter gardens! You can attach them to the side of a building or fence or hang them one above the other on chains or rope which makes a nice "green screen" gutter garden like a vertical garden. Make sure you drill some holes into the bottom of each section for adequate drainage.
Use some compost-rich soil and ensure that the plants you choose don’t require a lot of root space. Aim for assorted lettuces and mixed herbs rather than root vegetables.