Foam Core Board is the stuff to use. Cheap, light, easy to cut, easily available. You can even buy it from Amazon.
Rule out movement squares with a felt tip pen. Texture the surface with bits of paper, cardboard, sand, acrylic texture media, etc. Everything can be done with PVA glue. Seal the plastic foam edge with PVA and you can spray paint it with cheap cans of paint, then dry brush with cheap poster paints or samples of household emulsion.
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