From the pattern notes:

"I used sport weight wool sock yarn in a heathery blue (the heathery part is green and deeper blue and a little gold). If you wanted you could make them in that heathery light green Wool-ease or the other shade that’s a blue-green (forest heather?). The stitch pattern I used turned out to be stretchier than I’d anticipated, so I used US size 3 DPNs - you could go even smaller for a firmer sock.

I have embroidered little fishes here and there peeking out from behind the seaweed. I was going to add in darker green yarn on top of the seaweed, but the pattern is too pretty to mess with. Ditto for the white caps on the waves (the baby cable ribbing). I’m wondering though if I could add a little translucent sparkly fabric paint atop those waves. I am proud of this pattern because it’s the first of my ideas that’s really worked!! "