Melt the candy coating and shortening together in a microwave-safe bowl. Stir until smooth. If you want, add a few drops of paste food coloring to tint the coating.
Push a lollipop stick into each marshmallow. Dip each marshmallow into the melted coating, turning to cover completely. Let the extra coating drip off.
Roll the dipped marshmallow in colored sugar. Use a dab of leftover melted coating as "glue" to attach candy eyes, nonpareils, or other toppings to make fun alien faces.
Place finished marshmallows on waxed paper and let them sit until the coating is firm.
Notes
Nutrition (per marshmallow): Calories: 65, Total Carbs: 13g, Net Carbs: 13g, Fats: 1.5g, Protein: 0.5g.For a healthier version, use sugar-free marshmallows and skip the colored sugar. Nutrition is estimated; actual values depend on toppings used.