A few weeks ago, a lovely customer came in to Leonardtown with a pattern for a cowl she wanted to knit. The pattern was long and seemed complicated, but when I looked it up on Ravelry, I found that it was not so complicated - it's just that there were instructions for the same item in three different gauges. Anyway, it's a beautiful cowl with corrugated ribbing (which is a fancy way of saying that you're stranding two colors in ribbing) worked in two different colors of Noro. After a few rows, you offset the ribbing and begin again. The effect is a four-way color shift as the Noro's long color repeats change as you knit up. Seems hard to imagine, I know, but here's a close-up photo of her progress.
The pattern is free on Ravelry, and the pictures of all the different projects are spectacular! Please check them out here. Inspira takes just a few skeins of Silk Garden or Kureyon in two different colorways. You could also use more than two different colorways as you choose. It's kind of a starting point from which you can jump into your own creative space.