Silly Spider Web
I was also thinking that they'd be a perfect craft at a Halloween party!
Any size of embroidery hoop (I used a 7in)
burlap (we used orange)
lacing strings or yarn
If you are sewing with younger children or a large group, it's best to go ahead and fill the hoop with fabric. Once you have the fabric in there tight, just trim around the back.
Thread a ribbon with a lacing string, tie a knot a the end, and get to sewing. Encourage the kids to sew all around, any which way. Every so often, stop and add a pony bead "bug" or two or three to the web. When the string runs out, knot it off in the back and start again with a new string.
When the web is finished, hot glue a plastic spider to the web. Add about 12 inches of Halloween-themed ribbon to the top for a hanger.