Cover Characteristics: Book Covers featuring Tentacles

Tentacles is kind of an odd topic for me to choose since I don't read a whole lot of books that involve tentacles. What kind of books involve tentacles anyway? Books set out at sea? Maybe books about weddings if comedian Demetri Martin were writing them? I've read a few books that had kraken in them, and one of them did in fact take place out at sea. I also read a couple of books in a series that...