This is a Snap Fit Case/Bumper for an iPhone 4 that has a scorpion insignia on the back. It's a present for my friend's birthday. She likes scorpions. (Updated!)
Print it out, clean up any rough spots with sandpaper. Pop in your iPhone and enjoy.
Shortly I will be adding a slightly beefed up version that is designed to be a little stronger and hold the phone even more securely.
Case Version 2:
Per request in the comments, I have uploaded a thicker version of the case with the scorpion facing the other direction.