We'll be ready on Main Street when Halloween comes 'round. My spiderweb project is a finished flimsy and I'm calling it Cobwebs.
I used the white on black spiderweb print for the borders, as so many readers advised, and I think it was a good choice as it sets off the bright colors in the blocks so well. I'm still not sure about the binding: black, dark gray, orange? - but I can decide after it is quilted.
If you are interested in making something similar, the tutorial I used for the spiderweb blocks is on the Quilt It blog. Be careful how you handle the finished spiderweb blocks. You end up with a lot of bias edges on the outer edges of the blocks and they can easily become distorted.