Good theme criteria

What do you all look for for a good theme? For me, it's something that is going to create a wide variety of games, that is open to interpretation. Any "make a bad game" ones are automatically a no from me, for example "terrible controls" or "bad design", because I do still have to play these games at the end of it ๐Ÿ˜‚ so are any "make this specific game genre" themes are also dead to me, e.g. "platformer".