This awesome spiderweb by Sew Woodsy inspired me to make a similar one myself:
Using Sew Woodsy's instructions and string leftover from my Toe Tag Invites I made a 6" circle out of a piece of string. Then tied on the five strings that attach to the walls. I tied the ends of the five strings around small nails and nailed the basic structure to the wall. I used this base to build the other circles of the web. Once I had a basic spiderweb built, I covered it with fake cobwebs and attached plastic spiders.
It filled up the blank corner in the living room and I love the shadow that it casts on the wall and ceiling!