Cut out a 3 inch diameter circle from your cardboard. Paint it black or purple.
Cut out 1 ½ inch legs using your long pipe cleaners. 8 legs for each spider. If you make a black spider, use black pipe cleaners. If you make a purple one, use purple pipe cleaners.
Add the googly eyes and legs using glue. I recommend using liquid glue or a hot glue gun to make them stick better.