Is there a way to set Moon+'s interface to flat, instead of the grey tones and textures? A very nice reader which would work well on a tablet is Pocketbook Reader. (AFAIK, it has nothing to do with Pocketbook.) I've been testing it on my tablet. It doesn't have a lot of options, but it does work very well; it has a simple userinterface, and I would expect it to work well on an e-ink device.
Pocketbook Reader