I have taken a small amount of royal icing and kind of just glazed my cookies....and then I've laid my frosting sheet design on the glaze while it is still wet. I can then smooth it down and smooth it out. Note, this is a glaze, not a thickly filled cookie. I then let them dry and go back and pipe around the edge and add sanding sugar. I tried this technique with GREAT results when I did 750 favors for a local fundraiser. They turned out great and I was able to get them done quickly. I have pictures in my gallery of my image cookies. I use this technique all the time now. I do this with supreme icing sheets, not wafer paper. I've not worked with wafer paper.