I've made this one night three weeks ago for a Crazy Hat day at my job. I didn't have one, and didn't want to buy one, so I had some cotton yarn left from other projects and decided to make one. I was doing it without any pattern, just began with a small circle and kept going until it fit my head. It was all made in dc.
Here are some pics.
It turned out a little bit small, but I enjoyed it the same way.