3D printing is becoming more widespread, and Polychemy is using this technology in their new iPhone 4/4S cases.
Each case is printed with a special 3D printer and is made specifically to your order. You can choose from designs that mimic a fingerprint, swirl, maze, cell, and a Maori tattoo in white, black, red, or purple. You can even add your name that will get printed into the case.
Each case is $40 with $15 shipping anywhere in the world; orders totaling more than $100 are shipped for free. The only downside is that it will take between 15 and 20 days for the case to arrive.
Polychemy also has 3D printed silver pendants that can also be customized with your name.