Several days in advance: Use royal icing to make 6 snowflake arms and center ball. Copy Snowflake Arms pattern and tape onto cake boards; cover with waxed paper. Using royal icing and tip 8, outline 1 snowflake arm at a time; immediately sprinkle on Sparkling Sugar. Excess sugar can be collected and reused. Repeat until you have completed 6 arms (make extras to allow for breakage). Use tip 1A to pipe a 1 1/2 in. diameter ball; immediately sprinkle on Sparkling Sugar. Let all pieces dry 1 to 2 days. Carefully remove arms from waxed paper by sliding a small spatula underneath.