things to do with used tires?
['Build a castle, duh. Ok, technically this is called an "earthship," and it\'s meant to be an environmentally friendly way to build a house. ... ', 'Make flip-flops. ... ', 'Start an awesome garden. ... ', 'Build an obstacle course. ... ', 'Make furniture. ... ', 'Use them to get jacked. ... ', 'Create an outdoor staircase. ... ', 'Construct a wall or barrier.']