Playing in hats

I've gotten a bunch of cheap variegated blue yarn (by the pound, with unspecified name and fiber content; I'm assuming it's 100% acrylic) at one of the craft stores, thick enough to work up reasonably quickly, which lets me feel the glow of a finished hat that much more frequently. It's not 'exciting' yarn, but it has let me play with shape, prototyping without taking too much time. ( more, and a photo )