Follow the instructions on the cake mix box to make cupcakes. After baking, set aside to cool completely.
Press the non-decorative side of a large decorating tip into the top of each cupcake to form a well. Save the pieces.
Fill each hole with Christmas sprinkles. Then, replace the reserved cupcake pieces to cover the holes.
Place the star tip on a piping bag and fill the bag with frosting. Starting on the outer edge of each cupcake, pipe in a circular pattern working in towards the center of the cupcake.
Use the black gel writing icing to draw a haphazard line that travels around the tops of each cupcake.
Add colored ball sprinkles at even intervals along the line.