Here is a recipe for edible glitter!

It is an equal mix of edible sparkle or lustre powder, gum arabic and water. Mix a little of each to a paste, smooth over a baking sheet as thinly as possible and bake on a really low oven until dry. It takes around 10 minutes, depending on thickness. Then break up into tiny crumbs. Place the crumbs in a zip-loc and run a rolling pin over them to make them really fine. Sprinkle on cakes, etc. to add a touch of sparkle.