These public domain images were taken from the Template:Chess diagram page on Wikipedia. They are the "44" series of images. Poke around there are you'll see what I mean. I renamed and converted them to gif images in order to match Crafty's HTML.
Snag this zip file. You only really need the gifs contained within, but I included the png files because I had them. Or, if you wish, you can 'save image as...' the following images: