Here are some ancient Greek monster myths retold by Lin Donn.
Theseus and the Minotaur, the monster in the maze
Andromeda and the Jealous Sea Creatures
Perseus and Medusa (with snakes for hair)
In the Cyclops Cave and The Story of the Sirens
Hercules and the Stymphalian Birds
Hercules and the Lernaean Hydra