This is an idea that Mama Liberty had years ago. She gave out hundreds, but I never got one and the version on-line at TPOL was lost. I found her note about it and am now doing it with a brand-new card! Please provide your comments and other examples.
We all have a fistful (wallet-full?) of cards that we carry, but here is one more that may be useful.
The front is shown above. If you wish, print the back of the card as well (next image).
If you want to be more blunt, there is this one.