Assemble the witch hats. Using the orange icing, pipe a small amount of icing in the middle of a cookie then place a cone on top of the cookie. Then, with the smooth side of the tip facing out, pipe a band around the wide end of half the cones and smooth with a spatula.
Repeat the same step-by-step process with purple icing on the other half of the cookies and cones. When done, let them set for about 15 to 20 minutes.
Finally, use the bag with the yellow tinted icing with tip 3 attached to pipe a buckle around the band on the hats. Let them set for another 15 to 20 minutes and then enjoy!