Build a tiered herb garden using recycled tin cans. Start by collecting cans of different sizes, ensuring they have a similar circumference. Paint the cans in coordinating colors or patterns. Stack the cans on top of each other, starting with the largest can at the bottom. Fill each can with potting soil and plant your desired herbs. This tiered tin can herb garden is not only functional but also visually appealing, making it a focal point in your garden or patio.