I've just posted a zip file with a few backgrounds designed for the 600x800 screen of the Nook.
[img width=400 height=481]http://www.ossramblings.com/files/images/background-contactsheet.jpg[/img]
One specifically says Merry Christmas for those of you who are giving the Nook as a gift and might want to preload the image.
I've updated pack 2 to remove black side borders due to difference in resolution from screensaver to backgrounds
I just did a pack of 20 new images. Each of these are already set to 16 shades of grey, which I understand is what e-ink displays.
[img width=400 height=538]http://www.ossramblings.com/files/images/nookpack2.jpg[/img]
Download from here:
Enjoy! This will probably be all I'll do until the first of the year (after I can start playing with my Nook) and I will probably concentrate on screensaver themes for my next batch.