For kicks I've designed a business card for myself, mostly because I wanted to try out a real world application of QR codes. Whenever you receive a card from anybody you would actually like to contact again, you have to arduously enter his/her information. With a QR code you can scan the card and immediately send the vCard to your phone address book.
For my further amusement I also decided to create the cards using SVG. With no decent editor on hand, and since I wanted to familiarize myself with the standard, I decided to write them by hand (except the QR code, which was created with a tool). The result is fairly simple, but very scalable and portable.