There's a new Book Design added to the picture mixer. It lets you put a custom front and back on a 3D book model. If you want, you can animate the book flipping from a view of the front to a view of the back, and tell a little picture story that way - just hit the "make animation" button. Remember that after you make an animation, you can adjust its timing. It is often good to add a longish pause between the end of the animation and when it starts over again, so as not to make it too overwhelming visually.