No hack that I know of. As a more labour intensive solution, I think you can put a an image file onto the device, put it on your homepage, and switch to it before sleeping. (Might be useful for people who want to have, for example, a train map, too.)
ETA: Hm, or perhaps not. I think this used to work, though. Anyone? The only way I can get it to work (Aura, current firmware) is to create a blank book and put the image I want as the cover of that book.
Last edited by meeera; 03-20-2014 at 12:43 AM.
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