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Don't knock it! I walked into our shed-come-storage-come-studio and found a half-sheet of Celotex and a set of PAR64s so I plugged them in to see if the idea was a goer.
I didn't put a camera on the results, but my eyeballs told me that the effect was good.
You can also use PU foam boards as cucolorises. They are very light, totally ridged and therefore easily rigged.
(BTW, cucoloris is originally a German word meaning a foolish act or way of behaving. That's why the director H.Rosson referred to a badly improvised lighting mask as a "Kookolorus-thing". He'd probably picked up the word when working in NY where many, many people spoke German at the time.)Back to Lighting...