Clip art is fine for basic illustrations, but everybody has access to the same collection of pictures. To make your workbooks unique, you can insert your own photos and other pictures, too.
You can insert either pictures you've added to iPhoto or pictures that are in your Mac's file system but not in iPhoto. Because iPhoto is Mac OS X's standard application for importing photos from a digital camera and editing them, you'll probably want to use it much of the time.
To insert a picture from iPhoto, follow these steps:
Media Browserfrom the menu bar to open the Media Browser.