Ok, we all love to get them, so how can you be unique? As an ad guy (my day job) I'm always looking for ways to stand out.
So here are some ideas - snap a shot of yourself while working a station then upload it to walmart and print a custom card each time. For just a few cents each you can have it printed on photo paper.
Or even better, print plastic "credit-card" style cards. I guarantee that no one has ever gotten a QSL card like this! Go to 4colorprint.com, upload your image and boom! They also make GREAT eyeball cards for the next ham fest!