I love cards and have just received my pack of gamification inspiration cards by Andrezej Marczewski. I got the Black and White cards, but he has just made a version in colour as well.
Andrezej designed these cards (53 in all) to help inspire ideas and build new and interesting gamified solutions. They have been developed to work hand in hand with his user types (Achievers, Socialisers, Philanthropists and Free Spirit).