Okay, I realize that these are not actually "stuffed" plantains in the manner of croquetas, but the fried plantain serves as a bowl for all sorts of cute toppings.
To make the shells, follow beginning of tostones recipe, but so not flatten a second time, rather use a shot glass or something that approximate size to form a bowl shape to the fried plantain, then continue the normal recipe to finish.
Shrimp, Queso Fresco and Avocado
Cuban Style Picadillo
Pork Carnitas-you can also use a pork butt for this recipe, reduce cooking time accordingly
Black Beans & Goat Cheese-follow the recipe, but rather than add plantains, use filling in plantain shells