I thought about the many kinds of decks out there and thought to myself outside of gaffs and colors what really hasn't been done. This may or may not have been done(not sure), but here's the thought. You purchase a deck of cards labeled "Dark Light" the box appears blank on all sides...so you open the box and pull out the cards and to your confusion they appear blank on all sides as well. Your thinking to yourself "five bucks for this?" then while you're holding both the cards and box you walk by your blacklight placed above you magicians workbench and there it is. A deck and box that is only seen under a black light (and possibly glows too). So there it is an idea I've had after seeing so many decks out there.