Look for colorful ice cream cones at the grocery store or find them online, or use regular ice cream cones.
Ice cream cones might shift slightly while in the oven. If this happens, you can carefully adjust them during baking, or simply trim off the unevenness with a paring knife once the cupcakes have cooled.
Chilling the cupcakes in the freezer makes them easier to frost. If you don’t do this step, the cake crumbs might show through the frosting.