Chicago

Rules: Seven Stud, but the high hand splits the pot with the highest face-down ("hole") Spade.

Analysis: A popular game with a strong dash of luck. Keep track of which Spades get burned face-up; if you find that you have the highest face-down Spade possible, there is no particular reason not to bid up the pot aggressively.

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Occupy Chicago: Chicago, but after the fifth card is dealt (before betting), have a vote of all remaining players. If all, or all but one, vote for it, the game becomes Detroit instead. (That is, it becomes low/low.) Use standard high/low vote with chips.

Rlyeh: Chicago, but a down card is dealt to the center. At end of game, that card is flipped; all cards of that rank are wild.

Splitsville: Randomized Chicago. After first betting round, reveal a card; if 8 or higher, the game is high. After next, reveal another; if 8 or higher, high down card splits, else low. After next, reveal to show the target down suit.