this isn't a tattoo but it has a similar theme to my idea. A beautiful sketch like this would be stunning.
Brush Circle Fishes - www.tattootemple.hk
Tattoo Carp Koi by ~Seocha on deviantART
Subtle koi fishes. South Korean tattooist Banul
Work of David Hale.
João Chavez - Polygonal Fish tattrx.com/artists/joao-chavez
koi by Tracy King