I was going for a Tiffany-blue here, but I don't think it quite worked. I mixed Sky Blue and Leaf Green.
I think the gold sparkling sugar adds a lot to these cookies. They looked a little plain to me before adding it. (Now that I am typing above all those dots and squiggles, it seems funny to call them plain, but trust me here.) :)
Here's a picture of my "sanding sugar station." In the silver cup, I have a mix of meringue powder and water. With my kids' paintbrush, I paint on the mixture and sprinkle on the sanding sugar over a coffee filter. After a several cookies, I use the coffee filter kind of like a funnel to pour the excess sugar back into the container. It doesn't roll off like it would on a plate or a paper towel.
Ateco is the brand of meringue powder I use. It is difficult to find since Sur La Table quit carrying it (grrr!), but instead of driving down to the cake decorating store, I ordered it from Amazon. It ships from a different company and I was thrilled when I ordered it on a Monday and it arrived on Friday!!! I highly recommend it!