Add colored sugar or sprinkles to your cookies. If you want to make a pattern with another color of icing, wait an hour for the first layer of icing to dry completely. Then mix a small portion of sugar cookie icing
with food coloring in a separate bowl. Spoon the icing into a clean plastic bag, cut off the bottom tip, and pipe the colored icing onto the cookies in any pattern you desire. You can also use gel icing to add more decoration to the cookies. Gel icing comes in lots of different colors and textures (there's even sparkly gel icing), and it's already in ready-to-use tubes.