This is a brilliant idea! Cheri Alberts of The Watering Mouth shows us how to make shot glasses using just marshmallows. The delicious cups are entirely edible. Just toast a marshmallow over a fire or a hot stove. Bake all sides except one, which will implode. Pour liquor or liqueur into that hole.
You have to drink them pretty quickly. So I suggest making 10, then immediately drinking them. Then repeat the process as often as necessary.
-via That's Nerdalicious!