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Pinner called these 'Wheel Chairs'--very creative design. But I would worry about the tires leaving 'tire tracks' ('scuse the pun) on clothing. Love these though. The base is metal tubing for support.
I have to admit, I find these recycled tire planters charming. Planting containers made from tires are pretty easy to make and cost almost nothing. Since it costs to dispose of tires, getting a few used wheels from a local auto shop should be a snap.