A versatile shell-shaped baking mold can be made from either food-grade silicone or metal, depending on the pastry type. Silicone molds are best for non-baked goods like chocolates, candies, and cold desserts, while metal molds are ideal for baked items like madeleines and small cakes. Both types are useful for a range of pastries, with silicone molds also being popular for crafts like soap and resin making.