Kindergarten artists made spooky spiderwebs with glue and chalk pastels. We started by practicing drawing spiderwebs on white paper, then drew one on a piece of black paper. Then we traced over the lines with white glue. When the glue was dry, we used chalk pastels to fill in the rest of the page with color. The chalk pastel (ideally) doesn't stick to the paper where there is glue.
Here is the inevitable "let's see how much chalk I can get on my hands" moment: