Reply by CorpseQueen

You can cut flat numbers the size you need from gumpaste or fondant. Attach wire to the back (for insertion into the cake) and coat the front in disco dust/edible glitter to give it the sparkle you were looking for? Or you can do what I see many people do and roll out a “log” of fondant or gumpaste, curl into the number shapes you desire and insert a wire into the bottom for insertion into the cake.

-- Nikki, So Cal, www.Facebook.com/nikkibelleperchecakes