Cover cookie sheet with waxed paper or cooking parchment paper. Enlarge or reduce patterns (use your browser’s search to find and print snowflake patterns); slide patterns under waxed paper. Trace patterns by piping on frosting, tracing longest lines of pattern first. Use a small paintbrush dipped into water to smooth any irregularities, working on each snowflake as it is piped. For candles, draw snowflakes freehand or use toothpick or pin to etch design before piping icing.