Shelf liner and a water heater pan are the secret ingredients in this giant snowflake display. First, cover the base of the pan with shelf liner. Proceed to trace or print out a snowflake pattern onto paper, center the pattern over the pan, tape it down, and then use a craft knife to cut around it. Drill a few holes into the pan so lights can show through, and then spray-paint around the stencil. Mount your snowflake high up on your house for all to see.