Ok, I thought you all were a bunch of Baldur's Gate 2 freaks, but apparently I'm the only one here
The books in the screenshot I posted are all image files from actual books used in Baldur's Gate 2. For instance, the yellow-red book (the one with the yellow 'egg' on the front) is the general image used for books in Shadows of Amn. And the right-most of the 'books' is actually a Scroll Case.