I admired Amy Butler's skull cap design in her book Midwest Modern, but only stumbled on the pattern this summer. (Turns out it is part of the Blue Sky Hats pattern, and isn't shown on the front of the pattern...just in case you want to make one too.)
Ignoring Amy's instructions completely, I used two layers of cotton jersey scraps for my cap (not woven, as the pattern intends) -- a pewter grey on the outside and an earthy brown on the inside. I then drew some freehand designs on the outer layer of cotton with a Sharpie, stitched the two layers together with red buttonhole thread, and then stitched the six pieces together. The bottom is bound with one of my favorite sewing notions, Mokuba folded elastic.
The hat fits me perfectly, but I just couldn't deal with setting up a self-portrait-style photo shoot today (and did I mention I'm growing my hair out?) -- so thank you to my girl for allowing me to snap a few photos for show & tell.