Well I saw this I knew I had to try that. This is a very inexpensive craft.
All you need is some glue and some glitter. I found white school glue to be the best, although I also used some gel glue. It made thinner webs.
Also something to put them on. A piece of wax paper works great.
For the webs I drew circles around each other. Each one a bit bigger. I simply eyeballed this, but if you wanted more perfection you could easily print something off of the computer and put it under the wax paper as a pattern.
I then drew lines through the circles.
If you decide you want to try your hand in these I would love a link back to be able to see how they went.