piebald is a recessive trait, so you would have to have two het piebalds to make any piebalds (1:4 chance). if you wanted to just have one het to a non piebald morph, you'd be playing HUGE gambling games by breeding the offspring. it would probably be easiest to buy two het piebalds, breed any piebalds you may get to the albino, and then rebreed the double hets (since albino is also a recessive trait). Thats if you don't want to spend the money on the shortcuts though