Send out a warm welcome to your cool gathering! Fold a 5-in. x 7-in. piece of white paper in half crosswise to make a 3-1/2-inch x 5-inch piece. (This is the minimum size the post office will accept.) Open and write invitation on the inside. Fold a 5-in. x 7-in. piece of card stock or scrapbook paper in half. Place the white piece of paper inside. Apply rubber cement to one side of a homemade paper snowflake. Immediately sprinkle the snowflake with clear iridescent glitter. Let dry; shake off excess glitter. Glue snowflake to the front of the invitation; let dry.