Because these creepy critters don't take long to hatch, you can turn them out by the dozen.
Cut the cups off an empty egg carton and place them on newspaper. Paint the cups, inside and out, with a coat of black acrylic paint.
Use the end of a paper clip or a pushpin to poke four holes along the bottom edge on one side of the cup. Poke matching holes on the opposite side of the cup.
To make fuzzy legs, cut four black pipe cleaners into 7-inch lengths. Thread a pipe cleaner through one of the holes, into the cup, and out the corresponding hole on the other side. Make sure the ends protrude an equal length from both sides of the cup and bend them upward at the base of the spider's body. Fold in the opposite direction midway down the legs to create knees and bend the tips to make feet.
Finally, glue on googly eyes.