They could be used as placecards:
Photo: Karen Mordechai via Style Me Pretty
They could be given out as favors:
Photo: Sweet Fine Day
You know how people traditionally serve coffee after the meal? I don't drink coffee and am always hoping they'll have hot chocolate for me. So I love the idea of plenty of hot chocolate, complete with big fluffy marshmallows:
Photo: Butter Sugar Flour
Maybe even heart-shaped ones:
Photo: Martha Stewart Living, via Wedding Bee
Or they could be integrated into the cake:
Photo: Lisa Dawn