A little while back I was looking for a way to quickly create icons to differentiate my project folders and speed-up my workflow a bit. I found exactly what I was looking for in Pic2Icon. It’s a droplet application for Mac OSX that turns an image’s content into its icon. It works with transparency and even layered Photoshop files (CS3 included). Once the icon has been applied to the image file, you get run a get info (cmd + i) on the image and the file you’d like to apply the icon to. Click on the image’s icon in the upper left of the get info window and copy it (cmd + c), then click on the target file’s get info icon and paste (cmd + v). Voilà!