I whipped these up quickly using Trading Card Maker. You can design a card once and then tell it to print out nine copies -- that's how you get a whole page. I found the picture on the interwebs and I'm sure it belongs to someone... I can't even find it again now... :(
I figure I'll write on the cards to give them clues about the nature of the potion. Eventually, I'll write the name of the potion itself. When it's used, they can tear up the card.