We did the jump-rope rhymes too--double-dutch was THE thing, but I was taller than everyone else and they always whacked me in the head with the ropes, so I always had to be a rope-turner rather than a jumper. I know there are some books of jump-rope rhymes out there and I keep meaning to get ahold of one as a sort of folklore research project (they probably don't contain the "rude" ditties, though).