At first I thought I would use the plain blue for the rib and the short change variegated blue for the body of the hat. I knitted the hat in the round on a small circular needle, and as I came to the end of the rib, I wondered whether I should go for stripes rather than contrasting sections. Then I wondered what effect would be created if I knitted one row of plain, followed by one row of variegated yarn. So I had a go:
When knitting in the round you can do single row stripes, which in fact don't look very much like stripes at all. I liked this effect, so carried on to complete the hat:
Overall it gives a rather shadowy effect, which I think adds interest to the hat. I shall play some more with this technique!