This is the hat from the Sally Melville Purl Stitch book and I made it out of...uhm...? I made it a few years ago and am just getting around to photographing it. Come on, you're lucky I even remember I knitted it.
Re: yarn, it is worth noting, the yarn I used was discontinued (may have been Katia somethingsomething?) but I saw Lion Brand has started making the same fiber content and colorways almost exactly! So you can get it for dirt cheap at Joann Fabrics now, I guess.