What to do with steampunk playing cards?

[Kami2awa]

A friend of mine very kindly gave me a deck of steampunk themed playing cards for my birthday. I'd really like to use them in some way in an RPG, either in character (representing a game IC) or as an ooc mechanic.

Any ideas? I play a wide variety of settings and systems so I'd love to know how you would use them, as I can probably use that idea myself.

These are normal playing cards, BTW, other than pretty steampunk designs, but they did come with a spare blank card so I could add a custom one.

[The Glyphstone]

Sounds like they'd be absolutely perfect for Deadlands, a Weird West RPG. Its magic system is based on poker hands, and you actually draw cards as part of spellcasting.