Muppet character Gonzo is pictured with Lisa Henson (L) CEO of The Jim Henson Company and her brother Brian Henson, chairman of The Jim Henson Company during ceremonies honoring the Muppets with a star on the Hollywood Walk of Fame in Hollywood, California March 20, 2012. REUTERS/Fred Prouser

Full Story: Henson's early sketches of The Muppets up for auction