I’ve had a Kindle Touch for nearly a year now, and I love it. I’m doing my best to avoid upgrading to the Kindle Paperwhite (at least until I see one in person!), but I have one silly gripe: I want the screen saver for my Kindle (what appears when the device is ‘locked’) to be the cover of the book I’m reading.
The random images are nice, and could still be used if the Kindle locks while on its home page. But showing the book cover would be a lot more “booky” and might provide opportunities for casual conversation that the random images lack.