Isn't that I just said hats are perfect for Fair Isle swatches? I made several of them this summer. Here is the Star hat, a sister pattern of Tourbillion. The pattern is now available in my Patterns page, for just 99 cents! It's also available through Ravelry. Like Tourbillion, Star has an Estonian double-strand cast-on, which makes a decorative and elastic ridge -- my favourite cast-on method for hats, gloves and socks! Also, the charts for Tourbillion and Star are interchangeable. Feel free to use the swirly crown shaping on Star, and vice versa, to get four variations! I can't wait to see your version!