While still in its infancy, the sports collection of calling cards is a great gift for kids and adult sportsman alike. My brother, a grown man, has a set of the basketball cards and tends to use them frequently.
Popular in the 1800s, personalized calling cards have made a great resurgance in popularity. They are the perfect card for situations where a traditional business card would be too formal, but you will wish to give out your information or let someone know you stopped by.
Alternatively, they can be included with a gift in lieu of a card, or included with a small package when a traditional card doesn't seem necessary.