I'd love an AU scenario where Ned survives the events of AGoT - either by leaving for Winterfell by boat when he plans on it and stopping by Dragonstone, or escaping (maybe with Varys's help) pre-execution, and rallies to Stannis's cause to help him claim his crown. Bonus points for a Stark family reunion! (Well, Ned, Catelyn, Robb, Sansa, and Arya at least!)