Preheat oven to 200°. Line two cookie sheets with parchment or Silpats.
Combine egg whites, cream of tartar, and salt, in a mixer bowl.
Beat on high speed (with the whisk attachment) until pale and foamy.
Add sugar slowly, a tablespoon at a time, beating between each addition. When all the sugar has been added, continue beating until the meringue can hold stiff peaks.
Stir in vanilla extract.
Transfer the meringue to a pastry bag fitted with a large, round tip.
Pipe snowmen onto the prepared baking sheets. The smallest circle should be about 1" in diameter, graduating to larger circles. You can either make smaller, two-circle snowmen or large, three-circle snowmen.
Use the colored chips or sprinkles to decorate the snowmen with eyes, a "carrot" nose, and buttons.
Bake the meringues for 80-90 minutes. Allow to cool completely before removing from the pan.
Store in an airtight container up to two weeks.