Poladroid is an easy and fun Polaroid image-maker for the Mac.
To make high-resolution Polaroid-like images out of your digital photos, just drag and drop your images into the program, and wait.
Getting a little impatient?
You can shake the picture to make them develop faster, just like the real thing.
The app automatically crops your images to the appropriate size, and even adjusts the colors and clarity to match the Polaroid style.