My family adheres to the black-eyed peas thing but I would just as soon as vomit than to eat them!
My own superstition is that my house (including laundry and dishes) should be clean bringing in the new year. Same thing about new clothing for the first day of school or first day at a new job.
Not that I am not clean any other time but sometimes you have those pesky bathrooms and other miscellaneous chores hanging around.
Oh, well, I better get to cleaning