Making big creepy spiders is easy using
styrofoam balls and pipe cleaners.
I found styrofoam bugs to be more versatile vs. the heavy store bought ones
being that they're lightweight and
you can hang 'em just about anywhere without weighing the cobwebs down.

I used 4" styrofoam balls, black paint, pipe cleaners and a sheet of orange felt.

Sitting in the tree waiting for his prey!