Those fruit slices (Rokeach used to make them), the raspberry jelly rings, and Oberlander rainbow cake are things I look forward to each Pesach. Oberlander’s sandwich cookies are also really delicious.
One other thing you may find an oddity: I make pignoli cookies for Passover, using Israeli passover almond paste/marzipan (if I can’t find it, I make my own using homemade almond paste from blanched Klein’s almonds), egg whites, sugar, Passover confectioner’s sugar, and pine nuts. Simple, naturally and inherently good for Pesach, and a taste of Sicily.