Ensnare trick-or-treaters with this crafty doormat that resembles a spiderweb. To make, cut a 3x4-foot lightweight black mat into a 36-inch diameter circle using heavy shears. With chalk, draw a spiderweb design onto the mat. Cut clothesline into pieces to fit your design and singe the ends of each piece to prevent fraying. Use heavy-duty white glue to attach the clothesline pieces to the mat, covering the chalk lines.