It would be! I've done some pages in the PL App using card sets I bought here. You just treat the cards like photos, and then you can pull them from Dropbox or wherever you want to store them. Journaling is less convenient because you have to use a 3rd party app like Over to add the text first, but the pages look great! Some of our SSD designers also have card sets you can buy directly in the PL App.
Great idea! I might just put all my cards in a fold. Who sells sets in the app?