ok, well here are a few more things that come to mind:
Artificial decking. As long as it doesn't have any fungicides or other chemicals it should be safe and relatively easy to work with
I'm sure that plastic fencing material could be made to work
You could modify a cabinet or workbench
Closet shelving materials might work
You could make a cool looking rack out of ceramic tile and pavers. Just use liquid nails to hold it all together.
House siding could work.
really anything that has some strength and weather resistance will work.
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