It's Calorimetry from Knitty. I found it on Ravelry as I was searching for something to do with this gorgeous yarn. This next picture shows the colors a little better, but I like the way both pictures look.
This thing is a ponytail wearer's answer to a hat. The description with the pattern says, "this headscarf allows you to wear your hair up while keeping your ears warm and preventing heat from escaping from the top of your head." Very clever. If you look at the pattern on Knitty's website, you'll see it on a person. I'm just not feeling up to modeling it for you. I don't even have a ponytail.