Ever look at a book and think, Wow. Those pages are really nice. That cover! Impressive.
Personally, I like the pages that are rough on th edge, as if they've been torn from an important manuscript. Not quite white, but more ecrue. And the size--I know it's more expensive, but I like the larger paperbacks that are so popular today. They seem more authoritative while still giving concession to the economy.
The cover? My ideal cover would have muted colors and a deep black title that really stands out. The cover would be a blur of impressionistic modernism. I know that doesn't actually mean anything, but I don't yet have a reason to be more clear.
Some of my favorite covers? Michael Gruber's The Witch's Boy, Stieg Larsson's The Girl Who Played With Fire, Louise Penny's Bury Your Dead, Tana French's In the Woods, and Tasha Alexander's Tears of Pearl. You'll notice they are all different but all so appropriate for their contents, all beautiful in their detail.
All thoughts of publisher's input aside, how would your ideal book look and feel?