Step 1
Dust a little cornstarch onto your work surface to stop the gum paste from sticking to it. Then roll out the gum paste to 1/8 inch in thickness.
Step 2
Using the tip of a small sharp knife, carefully cut out 12 holly leaves. (You may find it easier to make a paper template first to cut around.) Leave them to dry in the refrigerator for several hours, or ideally overnight, until hard.
Step 3
Using a small paintbrush, lightly brush the cooled boiled water over the surface of the holly leaves. Cover with edible glitter and shake off the excess, then leave them to dry for a few minutes.
Step 4
Fill the pastry bag with frosting, twist the end tightly, and squeeze gently until the frosting starts to come through.
Step 5
Hold the bag vertically and slowly pipe a ring of frosting around the edge of a cupcake. Continue in a spiral until you reach the center. Stop the pressure, then push the bag down and up sharply to finish.
Step 6
Poke the holly leaf into the top of the frosted cupcake. Frost the remaining cupcakes in the same way and arrange a holly leaf on top of each to finish.
Step 7

This holly leaf cupcake recipe is excerpted with permission from <a href="http://www.amazon.com/gp/product/1845337158/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1845337158&linkCode=as2&tag=craftfocom-20">"Cox Cookies & Cake"</a> by Patrick Cox and Eric Lanlard, and published by Mitchell Beazley (Octopus Publishing Group).