House and Home online has a great DIY of how to make a Moooi Random Light style pendant. I actually had a failed attempt at this DIY last year that involved twine and fiberglass resin. The cotton and fabric stiffener looks like it is much easier to work with. Ikea is your best bet for the light cord, and I found that a yoga ball made a great size for wrapping. I may have to give this another attempt now that I know the secret.