Strawberry Pyramid. Build a pyramid planter for your strawberries. Each hole in the concrete block will hold more than enough soil for a strawberry plant. Wooden pyramid options I've seen waste too much soil under unused space. Once the plants grow in you will have a nice strawberry terrace effect. If you just make a border of blocks and don't terrace out the center, fill it with soil to plant some herbs or veggies.
Each time you crack an egg open, instead of tossing the shell into the trash, drop it into an open container that you keep in the fridge. When the container is full, crush the shells into small bits and sprinkle them around the base of your plants. The sharp eggshells will deter slugs, snails, and other bugs from nibbling on your garden and add a touch of calcium to the soil.