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I had never heard of food markers until seeing a post on decorating marshmallows (see link below). You can get a set of the markers on Amazon for $16. They are made from food color and are edible of course! I think these would be great for decorating cookies, marshmallows, hard boiled eggs, hard icingthe possibilities are endless! I think the designs on the marshmallows by The Decorated Cookie are super cute!