From the article: "Does it involve changing the colour of their skin?"
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I'm curious if that includes dressing up as the Wicked Witch of the West, from the Wizard of Oz / Wicked, with her green skin.  Or perhaps Gamora from Guardians of the Galaxy with a similar skin hue.  Or, for that matter, even dressing as a clown (Pennywise from IT?) with the white face paint?