Each hexagram has its own traditional meaning, so different oracles could pattern off of those, and create more specific instances of those archetypes for the kind of oracle. Say you wanted to redo Vincent's "Blood & Sex" oracle with the I Ching; the three of spades reads, "A camp-wanton, pretty and pliant, prone to drink." That might provide you with a good "Blood & Sex" version of hexagram 54, "Kwei Mei," or "Marrying the Maiden."
You just flip a coin six times, and there you have an oracle. You've got 64 hexagrams, as opposed to 52 cards in a playing deck, so you have a comparable amount of diversity in your possible outcomes. I think something like this might end up working well for my game, so I wondered if anyone else had thought of this or tried it out?