The strippling technique is used on the taco shells in the below picture. To complete this technique, flood your icing on the cookie. Once it’s dry, use a paint brush and dab more icing on top. You can also choose to wait until the icing is crusted and gently press icing with a paint brush.
Directions on how to do Strippling provided by Donna Lugg-Rogers on the FB Group, Crying Over Cookies.