You can change the overall design of your book by choosing a new book theme.
To change a photo book’s theme:
The book pages appear in All Pages view.
Click the Change Theme button at the top-right corner of the iPhoto window.
The window updates to show a rotating display of book themes.
To select a book theme, click a book on the left or right to move through the book themes.
You can change other book options, such as the book type and background color. For more information, see Create a photo book.
When you’re ready, click the Apply button.