UPDATE: Master Splinter & TEENAGE MUTANT NINJA TURTLES Concept Art Today, we have new Teenage Mutant Ninja Turtles concept art that was created by Jerad S. Marantz. The images feature alternate designs for Master Splinter and Leonardo, Raphael and Donatello. What's especially interesting is that his version of the Turtles were less bulky than the final versions. Update! Some images were removed at the request of the artist. The city needs heroes. Darkness has settled over New York City as Shredder and his evil Foot Clan have an iron grip on everything from the police to the politicians.