Here, an abstract pattern of arcs is piped onto royal icing creating a canvas, which also gives these cookies a sophisticated elegance. You can use the colors shown here or create your own combinations.
Use a sharp paring knife to cut half of the squares in half to make rectangles. Use a metal spatula to transfer the cookies to the prepared sheets, grouping like-sized cookies together and spacing them 1 inch (2.5 cm) apart. Chill in the refrigerator or freezer until firm, about 15 minutes.