When there is not much room for a garden you have to go up. Vertical gardens are great for small spaces. Ideally you choose plants that climb up like beans and peas. But strawberries also work. It depends on the construction. What have you got around?
There are many materials that can be used in upcycling. One example are vertical gardens from plastic bottles like described in this post: Strawberry Tower from Plastic.
Other materials are milk cartons strapped to a fence or wooden pallets like in these pictures taken at urban gardens in Berlin:
Another way to use wood pallets is shown in the below picture, a more professional approach with an irrigation system.
Drink cartons accumulate over time in most households. Turned upside down they work as flower pots. When leaving the cap part open at the bottom it is a perfect drainage system. They can be hung onto a fence or balcony.
The sky is the limit.