I brought up an old automatic wind up baby swing we had in our basement from 4 years ago. Its in great shape except it doesn't always work for the 30+ minutes it is supposed to before it stalls out. My wife went out and bought a new one - battery operated this time. Anyway I have been doing a bit of brainstorming as to what to do with the old one. Its larger than most of the models you get today and looks something like the picture below.
<center>

</center>
The idea I have come up with is to turn the swing seat into a spider. I would paint the whole thing black to start. The 2 curved metal polls the seat suspends from would be wrapped in black fur and become the spiders back legs. I'd probably remove the seat and make the rest of the spider from scratch. I'm thinking glowing eyes and hairy legs. I would build either a dark spider cave or make some kind of giant spiderweb eggsack/cacoon to hide the whole frame. Across the front legs of the swing set I'll cover a thin blanket of spider webbing that would stretch outward each time the spider lunges forward. I might put a dimmed strobe inside the spider hole for effect. Anyway this is my latest bit of brainstorming and thought I'd share.
<center>“by the Pricking of My Thumbs, Something Wicked This Way Comes.”</center>