In the novel Biting the Sun by Tainith Lee, the main character at one point plays a game which is generated on the spot based on scanning her mind to find out her likes, dislikes, and what she's currently in the mood for; the game is delivered as an induced dream.
http://www.amazon.com/Biting-Sun-Tanith-Lee/dp/0553581309/ref=sr_1_2?ie=UTF8&qid=1408090909&sr=8-2
That's an interesting scenario, but I think it gets even more interesting if we make it a bit less high tech and more of a conscious process. Let's say we had a truly human-like AI and it could instantly brew up any game you wanted - you just had to seed it with 3-5 memories of something you liked. Recommended memories would be of a book, movie, anime, or other game. If you adore one aspect of your seed idea but hate another, you can specify to the AI which part to include and which to ignore. So! What seed ideas would you pick so the AI could whip up the perfect game for you to play today?