OH Fun!
With my first son I craved crunching on ice cubes, I couldn't live without a big cup of ice cubes at my desk all day in my last trimester. Which was really wierd for me cause I hate to chew on ice cubes otherwise. The moment he was born that went away instantly. Oh and milk and mashed potatoes too.
With my second son MUSTARD!!! I couldn't get enough. I would send my husband to Subway and made him tell the sandwich maker to just keep squirting that stuff on. If I wasn't afraid my husband and Subway would think I was way too wierd, I would have just asked for a mustard sandwich. LOL