No, it's not a commercial for Cartoon Network. These animated antics were created for Kraft Foods, which is uniting its cereal mascots -- from Post Waffle Crisp's Grannies to Fred Flintstone -- for the first time. The spot, breaking today, kicks off a "Post Kids" promotion. As part of the effort, kids can create their own cereal boxes and cereals. Ogilvy & Mather
, New York, handles.