Wish you could sneak your laptop into a library? Or store it on your bookshelf? I'm not going to ask you why you're crazy — no judgments, folks — I'll just point you toward this BookBook, a hardcover cover for your MacBook that makes it look like a book. The illusion doesn't end when you need to use your computer, either, as elastic straps inside the case means it opens with your laptop, and shuts with it, too.
At $80, the BookBook is a little expensive, but it'd also make the perfect trigger for a secret revolving bookshelf.