Green monster
Frankenstein wasn’t green, and neither was his monster. In Mary Shelley’s 1818 novel, Victor Frankenstein was a normal human colour and his monster has the yellow skin of a corpse.
It was to convey this “corpse-like” effect that Jack Pierce, the make-up artist at Universal Studios, created the famous flat-headed, bolt-through-the-neck version of the monster, as played by Boris Karloff in the 1931 movie.
Though the movie was shot in black and white, all the promotional posters showed him as green and comic versions of the story followed suit.