For many people, Beatle wigs, blankets, cake toppers, Hot Wheels and "Flip Your Wig" games are an integral part of the Beatles story.     For others, they are collectibles, a tangible momento of the era when Brian ruled the Beatles roost, and the band might be on the Ed Sullivan show any given Sunday.       This week, the WTWF guys talk about some of the items they have added to their personal collections through the years, and which of the multitudes of modern-day licensees are worth your time and money.