Vampire/Werewolf AU: In which vampires and werewolves exist (in the case of canons that don't have them) or a character is recast as a vampire or werewolf. However, these kind of AU's don't necessarily have to have both species as some tend to focus on only one kind.
Victorian AU: In which characters from a modern or future-set story are relocate to a stereotypical Victorian romanticism era.

YOU ARE READING
The AU Dictionary
RandomA book explaining all of the different AU's. None of these belong to me. I got this from a blog I saw.