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I'm wary of concrete examples, because I'd really like to learn how to solve design challenges myself in future. Teach somebody to fish and that sort of thing.
Recently, I made this small Android prototype of a game idea I storyboarded over two years ago. I came back to it because I was feeling overwhelmed by all the reading I'd been doing, and wanted something I could just sit and implement. I didn't have much of a plan other than "text adventure game where you pick up the text as items and use them with other parts of the text". The idea came as I was thinking about ways a text adventure game could start simple and grow in complexity as the player acquires more tools.
I don't think I was particularly faithful to my original idea, changing things without really thinking about it too much. I showed a few people initially who seemed to really like the concept, which was motivating, but I feel like I don't know where to take it. At the end of the 3 levels I've made so far, there's a survey I put there in the hopes some people could tell me what is good about the game and what is lacking. But so far nobody has installed the game, so I still don't know what to think.