I've never had any major craving issue, I love love love the food I make and eat as a vegan. But...if I HAD to name one (er, make that two) they would be nostalgic throwbacks to childhood:
1. My family usually ate healthy, but once in a blue moon we'd eat grilled cheese sandwiches: white bread, margarine, a Kraft single.
2. On Christmas mornings we used to eat big homemade cinnamon buns...TRES non-vegan, though if I could find the recipe I'm sure I could veganize it.