What can I make from "styrofoam food take out"containers?

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I have been washing out and saving those square "styrofoam food take-out containers" because they don't breakdown at the "Dump or Trash facility" for many, many years and they aren't recyclable. I can't stand seeing things pollute our Earth so, I'd really like to find a use or reuse for them other than taking a sandwich to work.
In advance, I Thank You Kindly!
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