If you want to stand out from the crowd (your competition) you may want to consider developing a more unique business card. So even if the potential client doesn’t use your services, he or she may even hold onto the business card for later.
Some beautiful examples:
And you can find more on the Smashing Magazine article Business Card Design: Better Than A Plain Ol’ Business Card
Also, a good resource for ideas, inspiration or whatever is Inkd.
Lastly, you may want to watch this video: