Two options that come to mind are dream symbols and their meaning, or flower meanings, but I feel like the tarot table has enough symbolic prompts for now.
Maybe a table with elements and archetypes found in fairy tales, folk tales or myths? For example, "poisoned fruit", "makeover", and "cut thread", in reference to Snow White, Cinderella, and the Minotaur or the Moirai Greek myths. This way the prompts are general enough so they don't shoehorn the writers into writing a certain type of story, and at the same time the writers can substitute prompts for others from stories they like better, or from different places and cultures. (I'd love to read fics inspired in stories that aren't that well known.)
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Maybe a table with elements and archetypes found in fairy tales, folk tales or myths? For example, "poisoned fruit", "makeover", and "cut thread", in reference to Snow White, Cinderella, and the Minotaur or the Moirai Greek myths. This way the prompts are general enough so they don't shoehorn the writers into writing a certain type of story, and at the same time the writers can substitute prompts for others from stories they like better, or from different places and cultures. (I'd love to read fics inspired in stories that aren't that well known.)