My suggestion isn't a craft, but a gardening use.
Hubby cut old tires down one side, so you could open them up, then placed around base of trees. They will hold the mulch in without letting it get all over the place, and provide a bumper to keep the mower, weed eater from harming the trunks.
Do you have any children or grandchildren? A tire swing is the ultimate thing for kids. They would love it. Another idea would be that you could paint the tire, bright colors, designs or whatever you would like and make it into a flower bed.
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