It's only Mobi books that it matters for - as you say, it's pretty irrelevent for the Sony.
What I generally do, if I can't find anything nice on the web, is use a graphics package to create a 600x800 graphic, fill it with dark blue or black, and add the title and the author in 36pt white text, and use that as the cover image. That shows up nicely on the CyBook's "thumbnail" view on its library screen.
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