Prepare roll out cookie dough. Cut with spider web and spider from set. Bake and cool.
Use tip 5 and full-strength green flow icing to outline spider web; let dry. Use tip 5 and thinned down green color flow icing to fill in spider web; let dry. Use green FoodWriter to draw lines on spider web; let dry.
Use tip 16 and black buttercream icing to pipe legs on spider. Use spatula and black icing to ice spider's face smooth. Use tip 1 and white buttercream icing to pipe whites of eyes. Use tip 1 and orange buttercream icing to pipe dot pupils and outline mouth. Use tip 1 and white icing to pipe fangs. Position spider head on cookie.