Line a baking sheet with parchment paper. Dip one end of a lollipop stick into the melted chocolate and insert in a doughnut hole. Place on the prepared baking sheet and repeat with the remaining doughnut holes. Let set for 15 minutes. Reheat the remaining chocolate, if necessary. Dip each doughnut hole into the melted chocolate and let the excess drip off. Place upright in a cake pop holder or a Styrofoam block and immediately scatter colorful sprinkles over the pops. Let stand until set, about 15 minutes or up to 1 hour if you plan to package them. If you like, package the pops in cellophane wrappers tied with festive ribbon.