Seen on Kickstarter, a fun little project: The Photography Deck is a slick looking deck of playing cards, where the numbered cards feature rules and photography techniques, and the court cards feature unique photography-themed designs!
Each suit of number cards features a different category of useful photography information: camera basics, composition, technical, and shooting styles. A pledge of €12 (about $14 USD) gets you a deck, and there are savings for multiple decks. Definitely a great gift idea for a photography fan!