The Chancellor's head is made from a pocket gopher skull with an inset rhinestone, the body is made from a Devil's Paw Seed Pod, the wings are made from ribbon, and the clothing is made from ribbon, buttons, laces, and a small plaster cast.  
Original Design and Consruction by Peter Gardner. (Please forgive the crudity of these images, The Witch King was photographed by a professional, these were done with my webcam. )