Using the yarn from the solar-dyeing project, I whipped up a hat. I'm not exactly sure the dye took perfectly. I had rinsed it well, but without the kind of heat I use on the stove I worried that when I go to wash it someday the color would run out. So I used a black yarn in the hat, not only for contrast but because it wouldn't get discolored if the dye ran.
The pattern is called Icelandic Hat by Astrid Ellingsen, found on Ravelry. It's written in Icelandic so I just looked at the pictures and used the chart for the pattern.