Himalayan rabbits have black legs, tails, ears and nose, and white fur on the rest of their bodies. However, if an ice-pack is strapped to the animal's back, the new fur under the ice-pack will also grow in black, giving you a rabbit with a black square on its back. This is because the cold triggers the fur to grow in its black summer coat over the affected area. It occurs to me that you could use different-shaped ice-packs and make different designs on their backs; you could have a McDonalds bunny, if you so wished. Or an E2 one.