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Looking for ideas. What could you do with the springs from a old mattres?

I got a few old twin mattresses that I'm about to rip up and I hate to just pitch the steel springs when they could be used for something else.  Any ideas out there? 

Cut a circle or square out of plywood and mount your springs underneath. Works as a nice trampoline, toy boat, car( add some steering wheel, etc, but don't make it heavy), or make a few small ones to jump from one to another... Great things for kids in the garden.
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