Admittedly, a strange post, but so many of us have them still and rather than recycle them, here are some ways to extend the life of your business cards:
They're great for making a quick list for a small shopping trip because they slip easily into your pocket but don't scrunch up like a regular paper note does.
Use them for putting personal notes in the lunch bag of someone you love.
Clean the spaces between your keyboard keys. (The sticky end of a used post-it note works good for this also.)
A business card makes a pretty good toothpick in a pinch.
You can use them by the telephone to jot quick notes on.
Glue to nice patterned paper and make place cards for a wedding.
Noisemakers For The Wheels Of Your Child's Bike.
Sources: DIY, Associated Content