Stack tires up around a few potato plants. As the potato vine grows, add soil around the base of the plant so that the plant sprouts higher. This will lead to a much bigger harvest in the fall when you take the "potato condo" apart to dig for tasty tubers. Some disagreement exists whether tires will leach harmful chemicals in a vegetable garden, however.
Most discarded automotive tires are at least 6 inches wide, which is a good depth for a raised garden bed. With a utility knife, cut the sidewall area of the tire away, to make more room for soil. (The sidewall is the part of a tire where you find the manufacturer's name and details.)
Create a thick rubbery mulch for ornamental plants, shrubs and trees by chopping up old discarded tires into 1-inch fragments.
Tie a rope or two around a tire and hang it from a strong tree branch to enjoy a lazy hot summer afternoon.