Normally, I would go to the yarn store and look for a variegated yarn in black and gray. While the yarn store is open, I wasn't really in the mood to go out searching. Instead, I decided to play a bit with the black and gray yarns I had on hand.
This is what I ended up with...
I did not intend nor expect the pattern that emerged. I was just playing around with the yarn.
It turned out kind of diamond-y.
So, how did I achieve this? Every other round was "checkerboard". That is, I did one black stitch, one gray stitch, and repeated. The non "checkerboard" rounds were alternated black or gray. So...
Round 1: black
Round 2: alternate gray and black stitches
Round 3: gray
Round 4: alternate black and gray stitches
And I repeated those rounds, finishing on round 10 with an "alternate gray and black" round.
(I'm writing this out more for myself, in case I ever have to reproduce this.)
I almost just did stripes. I'm rather glad I didn't just do stripes.