I love cowls, especially those knit from gradient yarns. For this project I knit Lisa Bruce's free pattern Favorite Scarf Ever, with one ball of Lion Amazing, alternating with a ball of solid violet cotton and acrylic. When the solid violent ran out, I threw in a bit of grey wool.
The contrast is most dramatic with the grey, but still noticeable throughout.
I got a brainstorm when I realized that the zig-zags on each end would fit together like puzzle pieces. I stitched the ends together through the back loop of the last row of stitches, and alacazam! I have a cowl.
This knit up fast on size 10 needles and worsted-aran weight yarns, and I love the results. This goes into my stockpile of holiday gifts.