I agree with Harry about the sleep cover. I have one on my kindle. Even before that I never cared what showed up on my screen when I wasn't using it (It's usually in my knapsack/purse) because I'd not be looking at it.
That said, I had a Sony PRS T2 a few years back that allowed me to have the cover of the book I am currently reading as the sleep screen. I gave that one to my daughter and she loves it.
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