Every giant spider needs an egg sack full of giant spider eggs!
You just blow up a bunch of balloons and wrap them in an "egg sack" made of cheesecloth.
You can make all the eggs the same color, or use different colored balloons for variety.
Going Further Put LEDs in the balloons to light them up. Spray the balloons with glow-in-the-dark paint and occasionally flash them with black light to make them glow.
Spray the balloons with glow-in-the-dark paint and occasionally flash them with black light to make them glow.