The different colored-leaf sweet potatoes like "Blackie" (Ipomoea batatas 'Blackie') or "Marguerite" (Ipomoea batatas 'Marguerite') are unique sport varieties of the edible sweet potatoes and were selected and propagated based on the foliage, so you generally wouldn't be able reproduce the same foliage colors from plain supermarket ones. But you can grow a nice vine from supermarket sweet potatoes and actually end up with new sweet potatoes at the end of the season that can be dug up and stored.