SOMETHING FOR HALLOWEEN:  This interior version of street art randomness has Jack Nicholson, as Jack Torrance from “The Shining,” seen on an upper level floor at Zappos headquarters in downtown Las Vegas. Thanks to Brian “Paco” Alvarez, I was given a tour in areas not generally open to the public . . . Dig the Creative Vibe:  Zappos’s corporate culture is supported with murals and other art on walls, many by the employees themselves. There's been murals by guest artists too. Before the end of the year, a tour of some of the murals and art on the grounds will be offered, said Alvarez. While Jack is not likely to be on the official Zappos Art Walk, there will be a lot to see.