1/4 cup packed all-purpose flour, plus more for dusting
Two 17.5-ounce bags sugar cookie dry mix, such as Betty Crocker Sugar Cookie Mix (plus eggs and butter according to the package instructions)
2 cups confectioners' sugar, plus more for dusting
1/4 cup half-and-half, plus more if needed
2 drops black gel food coloring
12 ounces white modeling chocolate
12 ounces black modeling chocolate
If the modeling chocolate is too firm to roll, microwave for 5 seconds, then knead in your hands until pliable.