There are always the classic "mini-games" that almost all games include. 8-ball, slots, any gambling mechanic. Role playing mods are also a big hit with other games, the ones that allow you to create custom quests and such that other role players can then join in on "if they have the mod". There are endless amounts of things you can come up with ultimately the deciding factor will be the API will it support it. To answer your question, I would love to see some sort or texas holdem mini-game, even text based would be interesting =P
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