In the comments, Emily (TelmaQ) said she had a shawl in mind that would look good with my Koi yarn. But, she forgot to paste it in. She sent it to me, though, and she is RIGHT! It's a shawl called Andromeda, and it looks like waves, so it fits a water theme, but it is clean-lined and should work with the Koi! And it's by Miriam Felton, whose shawls I have done (and um, not done, since I still haven't finished Juno Regina). So, thanks for the fine suggestion, Emily!