In advance, using royal icing, make approximately 425 tip 16 stars in red and blue on waxed paper. Let dry. Assemble 8 fireworks sprays, 4 of each color. For each, gather 10 lengths of wire and fold in half. Cover the bottom 1 1/2 in. of folded end with florist tape. Attach stars to wires with dots of icing. Set aside.