We originally made this cowl in Yarn Stories Merino which has since been discontinued so we we took the opportunity to try it out in WYS Morris DK which was launched this year.
Knitted in two colours of Morris DK, the cowl shows how the fibonacci sequence can be used for designing stripes.

So long as you knit to the tension stated for stocking stitch on the ball band of the yarn, the pattern should work (in this case 22 st x 30 rows gives 10cm).