Edible glitter is available at kitchen specialty stores that carry cake decorating supplies.
Use waxed or parchment paper to keep the serving platter clean. Before frosting the cake, tuck strips of paper under the cake all around the base. pull away paper strips before the frosting sets.
Bake the cake; let cool. Wrap it tightly and freeze it for up to three weeks. Do not thaw the cake before cutting it into the angel shapes; frozen cake is easily cut and the frozen cut edges will be easier to frost.