Whenever I buy a hardcover book, I immediately strip it from its generic glossy jacket to show off the real fabric cover underneath. Yeah, they won't be protected, but the books look so much better on the shelf.
But here are some jackets I'd definitely keep on. Juniper Books will color customize them to create a clean and uniform look. Click on the photo to enlarge, and you'll notice the individual book titles printed within each letter. Pretty shnazzy.
{Image via Design Milk}