You may have seen my web page of the different cookie color palettes you can make. If not, you need to see it. I have an exhaustive video covering 10 ways to make them ( a few of them are my own inventions 😊). However, this page is all about PYO cookies with royal icing. I came up with using food color markers for the 'paint' and using it as you would with water and brush. It turns out nice. It's a WeCookier's world. I'm excited, are you excited?!
WeCookiers, Sugar Cookie Decorating