I was just wondering if you knew of a low sugar alternative to Royal Icing? I need something that hardens like Royal icing, but does not have loads of sugar or artificial ingredients. Do you think I could do something with cornstarch or instant potato flakes?

Sugar and egg whites are not artificial, neither is meringue powder. RI is high in sugar and I personally cannot think of anything you could use as a replacement that does not contain the same amount of sugar content and hardens.