The Consumerist today has posted a funny guide to recognizing and exploiting religious-icon-shaped foods. Picking through a bag of Cheetos, Chris Walters estimates there may be as many as four Jesus- or Mary-shaped chips per purchase.
It's partly a matter of luck, but it also takes a good eye for spotting the random edible miracle. You should also remember that context is everything: You might find a Shiva or an Apollo, but they're not going to be that newsworthy in the U.S., so stick with tried-and-true icons like Jesus or the Virgin Mary. A Cthulhu-shaped snack might net you some cult fame but probably not a lot of money.