Hi there!
I've been trying to install your sceensaver hack (the version to display the cover of the current book) but I seem to be a bit stuck atm.
The screensaver I'm seeing is your (NiLuJe's) one saying the hack has been successful but that a book cover hasn't been found. Is this an issue with the kindle side of things or with the ebook side of things? I use Calibre for my ebooks and have attempted to use the 'add cover' tool but this doesn't change anything, still stuck with your default custom screensaver.
Edit: Restored kindle to factory settings then reinstalled jailbreak, python, ss hack. It's now working great!

Not sure what version of jailbreak I initially had. Think the problem was with installing the python, perhaps?
Anyway, it's lovely to have all this info collected in one thread, thank you!