Jon Chesto, Patriot Ledger, December 21, 2012 Big Sky Balloons & Searchlights has produced plenty of giant, inflatable rodents since the company first created Scabby the Rat for a Chicago union 21 years ago. The rats are by far the most popular protest balloon. But its Plainfield, Illinois, plant has also produced a giant “Greedy Pig” and a leering “Corporate Fat Cat.” However, this was the first time that company co-owner Peggy O’Connor can remember being asked to build a mythological creature – in this case, an evil three-headed dog named Cerberus. ... Forget