Here's something that occurred to me...
Would it be possible to create a CCG in which every card was unique? As in each card is only printed once, ever. No one else who plays the game will ever have a card identical to any of yours.
I'm not planning to make such a game myself, but it's been interesting to think about. Having different art on all the cards would be impossible, it seems, unless it was procedurally generated, somehow. In the same way, it would be impossible to write different text for all the cards, so maybe you could have a number of possible numerical values on each card, plus an assortment of pre-designed powers. There would have to be millions of possible combinations, though.
Could this be fun? It would make opening new packs awesome.
Man that space invader thing is cool. What's so awesome is that you tend to read a shape or character into the random pixelation, and they all could really be used as minimalism game art. Perhaps the cards would only have those shapes on them, and the gameplay would revolve around the way that different colors interacted...