There's always card in wine bottle, card under wine bottle, not to mention there's also card under coaster, card to sugar packet, card to....oops.

There are plenty of options for non-card stuff. Take a step back and think about what you'd find in a typical bar/restaurant. Gather up a list of potential items and then begin a search to find resources that will teach you how to use said objects - or think about ways to apply what you already know to these items.
The potential is amazing, really. Coasters, creamers, utensils, sugar packets, bottles, drink glasses, coins, money, candles - that's just the tip of the iceberg.
That's my advice: Take a look at what is readily available, and go crazy.