i did some icing fireworks behind my cinderella castle. Using wires i piped small tip 14 stars along wires, both sides. gathered the wires together and then wrapped them onto a bamboo skewer to insert into the cake, since i needed them to sit high up. then spread them out on a slight curve. one of the wilton books shows how to do them like this behind the statue of liberty cake. my castle is in my photos.
If it was me, I would do three things.
First, I would pipe some 2-D images of shooting fireworks on different parts of the cake.(sides top etc.)
Second, I would try to make 3 or 5 RI fireworks on the end of some rigid wire to be inserted in the cake. Colors and lustre dust would come in handy here.
Third, I would get a small battery operated fiber optic kit from the floral dept. at a Michael's. It is about $7.
Prepare wire and fiber optic kit to not come in direct contact with the cake and you are ready to go.
Use odd numbers of decorations on the cake. The odd numbers fool the eye into not looking for symmetry.
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