A rare beasty

I'm always looking for different things for the studio, odd things that'll inspire the artists or give customers ideas about their next piece.  
There's a whole legend surrounding how the Koi swims up the yellow river through the golden gate transitioning into a dragon. Along the way it exists as a hybrid of the two forms known simply as a Dragonkoi and is a popular tattoo for people who've had a traumatic or deep rooted change in their lives.
I think I'll need to invent a whole new legend to explain a stuffed Rhinokoi though. Creative writing level expert?