Another idea from MaryAnn Kohl that we decided to try. The drops of food coloring were quite beautiful as they spread out into the thick corn syrup. We clearly don’t mind mess around here, but it was pretty sticky. My son stuck his hand in it to make a handprint and then stuck his syrupy tagboard onto the window. They are drying very slowly; we’re on day three and the thickest bits are still soft to the touch. But it’s beautiful – clear and shiny like glass!