Jenny's Amazing Vegan/Vegetarian 'Jello' Shots
ConAgra Snack Pack Juicy Gels(R) are vegan, Jell-O(R) brand is not. It might work with gelatin snack cups, but I have never tried it.
Try any combination of snack pack gel and liquor or liqueur you'd like. Some good ones are orange/peach schnapps ; orange/vanilla vodka; strawberry/apple schnapps; strawberry/coconut rum; cherry/chocolate liqueur; and cherry/amaretto.