I jailbroke my Kindle 3, using
this download. I then proceeded to apply the
Screen Saver Hack which lets you replace the pictures of all those authors by whatever you want. It worked perfectly and did not take long. The time consuming part was converting a set of family pictures to 600 x 800 grayscale png files.
The author of the jailbreak has an
interesting note about his hack for the latest Kindle firmware.