I was thinking of Kindle 3 for some time: eBook reader with paper-like light-reflective display available at reasonable price. In Chicago I noticed Kindle 3 version called “Kindle with Special Offers” (KSO) for only $114. It was attractive alternative for regular Kindle 3 available for $139. You can get this $25 discounted device only in USA; the deal here is that KSO displays books ads when switched off. I did not bother these “special offers” at all, but my “dismantle first” instinct pushed me to find out a way to get rid of it.
Reading about jailbreaking took 45 minutes of my spare time while hacking itself only additional 10 minutes. My KSO has 3.2 firmware version so I followed these instructions to apply jailbreak and unlock device and then to install custom screensavers. I made up hand drawing and saved as 800×600 PNG file, uploaded to device and voila!, when I switch off Kindle I see my drawing instead of random book covers I will never read.