Wallerizer was a little script I threw together to make wallpaper-sized versions of photos and illustrations on my computer. Often nice photos aren’t in the proper aspect ratio to fit on the desktop well, so this was my solution to that problem. Pretty simplistic as far as these things go, it takes the colors of the corners of the image and uses them in to make the gradients in an SVG underlay. I have a command line version floating around somewhere that provides a few more options. Such as, alignment of the original image on the output. It tries to preset a proper width and height for the user’s screen.
Link: Wallerizer