I needed to make a chain that was free flowing and looked like a real dangling chain. I remembered Andrew Hoyer’s super cool Cloth Experiment and wanted to adapt it. It turned out pretty good. I first limited the points to just one vertical line. Then had the last point draw an image. A few more minor tweeks here and there, including using jQuery mouse events instead of Andrew’s mouse events to resolve an isssue with the scrollbar registering clicks, and here it is, in the upper left corner:
http://orasidesign.com/see-what-we-do/