A fun game is thinking of random movies that don't usually come to mind re: musical adaptions and imagining how, in the right hands, they could be terrific onstage. Take a random number generator and apply it to the Criterion Collection, for instance, and we get Dreyer's "Master of the House", a satirical comedy about a tyrannical husband whose housemaid, once his nursemaid, cows him into submission through a game of psychological cat-and-mouse. Feminist dark comedy chamber one-act, easy peasy.
Or Ophuls's "La Ronde", in which we see a series of vignettes via a linked circle of people, hosted by a winking, reality-altering emcee. There's a linking theme of the carousel, of regret, of "ronde" music and dancing, I mean it seems so apparent I'm surprised it hasn't been done yet. Or Satyajit Ray's "Charulata", about a lonely housewife whose placid life, suffocated by her ignorant but wealthy husband, is turned upside-down when her husband's cousin, a poet, visits and helps her open herself up to new feelings, emotions, and ways of thinking. Or Babette's Feast, in which a housekeeper upsets the careful balance of a tiny, piously religious island in the Jutlands when she wins a lottery and puts on a lavish feast that dares its occupants to feel in a way that they've spent their lives denying. All stories of feeling and beauty that lend themselves naturally to music.