Now, technically, snowglobes are edible if you're sufficiently reckless. But redditor /u/bloomcakes created edible snowglobe cupcakes that will be completely pleasant to consume.
You can find a complete video tutorial above. Bloomcakes first inflated a balloon with water, carefully ensuring that the balloon was turgid to ensure no empty space at the stem. Then she mixed a "glass" out of sugar, corn syrup, and water. Dip the balloons into the mixture, then rest each one on a shot glass while they cool. Then drain the water slowly.
You can smooth out the rims with hot water on a plate so that when you top your cupcakes with the snowglobes, there are even lines between the frosting and the fake glass.