The Kilodeck is a card game system I'm designing, a 10-dimensional deck with about 1000 cards. For more information, including a color PDF of a draft of the entire deck, see here. A slightly more attractive but unofficial version is here.
Here are two maximally different cards from the Kilodeck -- that is, they differ in all 10 dimensions. There are 512 such pairs of cards in the deck. This pair appears in monochrome in my book Mindhacker: 60 Tips, Tricks, and Games to Take Your Mind to the Next Level, due out in late summer 2011.