I used the picture above for reference, according to Wikipedia it's a detail of a bestiary from Hokusai. I liked the more friendly-looking kappa, some of them were pretty creepy looking!
I made a sketch and translated it into sashiko-like stitches. On some sections I used the traditional sashiko running stitch, and some I used seed stitch. I really love the way it turned out!
I got a really cool piece from my fellow stitcher Lizzibabe, a quote from one of my all time favorite movies, The Last Unicorn, along with a stylized harpy.
Unicorn: That one is real. That is the harpy, Celaeno.
Schmendrick: Yes, the old woman caught her by chance, the same way she took you. Oh, she should never have meddled with a real harpy! Or a real unicorn for that matter. Because the truth melts her magic, always.