These photos are 600x800, too small for the DX, but should work on other Kindles. I'm on 3.0.2, but the screensaver hack works on the 3.0.3 as far as I know.
I followed this guide to jailbreak my Kindle.
https://wiki.mobileread.com/wiki/Kind...nd_3.x_Kindles
proceed with caution though.