I have a signature yarn color-way called "All Colors Self-Striping™" that self-stripes. Here is an example of that yarn knitted up by Michele from Easy123 on Etsy.
If you want yarn like this - visit my shop or email me.
This cowl was made from 120 yards of my handspun on size US#13. You can bump up to a US#15 or US#17 to make the yarn go farther, a little more drape and a little lacier look.
Didn't Michele do an awesome job? And you can see what I mean by self-striping very clearly in the first picture.