To make it even more addictive, you only crochet into every other stitch, and this makes for an especially soft, stretchy cowl-neckscarf-capelet-hooded-shoulderwarmer-snood-wimple-thing.
The Orbit Cowl crochet pattern is fully customizable and includes the "how-tos" along the way. You can see some styling and color editing experiments in its online photo album.
I'm just now thinking that I could have written it for many yarn weights! The one shown uses an "aran-weight" (kind of "chunky weight" or heavy worsted) and a J-US10-6mm crochet hook. (Isn't it great how the self-striping yarn* looks?) The customizing how-tos in the pattern should help with substituting any yarn.
*Crystal Palace Mochi Plus (80% merino wool, 20% nylon): 300 yards were needed for the size shown.
I also uploaded it to my Ravelry Store today.