Make mini snow cones by cutting out half circles of freezer paper. Roll the half circles into a cone shape and tape the edge shut with a piece of tape.
For each color of the truffles will need 1/2 cup of frosting and 1/2 cup of white chocolate chips. First, tint the frosting whatever color you want it to be. Use gel paste for a more intense color.
Melt the white chocolate chips for one color in the microwave and then stir in the frosting. Do this for each of the colors.
Put each color into a separate pastry bag. Slide all three bags into a larger pastry bag. To make this step easier, you can tape the three filled bags together if you want. Then, cut the tips off all 4 of the pastry bags.
Put a mini marshmallow into the bottom of each cone to prevent the filling from going through the hole in the point of the cone.
Fill mini snow cone with all three colors at once.
Put the sprinkles in a line on a plate in the same pattern as the colors of the truffles (green in the middle).
Dip the tops of the truffles in the sprinkles and refill the plate with sprinkles, as needed.
Allow the truffles to harden before storing them.