Stenciled cookies are easy to make and look very nice but they are also time consuming. Craft stores sell stencils of all kinds and sizes. First flood the cookie with thinned royal icing of your choice of color. Wait at least 8 hours or better yet, overnight before stenciling the cookies. I sprinkled colored sugars on top to give them that extra sparkle. Then I piped a shell border. And of course, I added a royal icing rose with leaves to the single rose cookie.
The stencils I used can be purchased here