If you failed to make an impression in person, then the only chance you have left is to make an impression with your business card. Plain old cards are boring. The way to go these days are interactive business cards and Bateske Design definitely got it right with their Arduboy digital business card.
It’s essentially a miniature, Arduino-based card that lets people play Tetris on it. How they managed to cram an OLED screen, capacitive D-pad, A/B buttons, and a piezo speaker into the 1.6mm-thick card is a feat in itself.