Well, I was just sort of wondering if the surface would be so thick that the deck itself would be too unweildy to shuffle properly. There's that plastic coating used, usually, for one way holographs are made.
I've seen flatter holographs like on baseball cards, but the surface is too delicate (they laminate it on the card, it's not good for continual handling).
Which way were you going to go on this? Is there someone local who has done holographic cards/items that you like the work of?