Here is an the thread at the-ebook.org with some "screensavers"
http://www.the-ebook.org/forum/viewtopic.php?t=9807
Do not be afraid to visit the link. The text is in Russian, but pictures are pictures in any languages. Well, there *are* some pictures with russian text that I find funny or amusing.
Screensavers are pictures that PocketBook can display during boot or when switched off.
They belong to the /system/logo