Widgerador is a simple and easy to use application designed to help you create image widgets that can be imported in iBooks Author.
Widgerador allows you to import the images you want to use and will automatically match their size. You can easily rearrange the images, adjust their shadow or write a caption underneath each picture.
The next step is to export the project to a folder of your choice. The Widgerador slideshow can then be imported in iBooks Author, and integrated in one of your projects.
NOTE: To buy Widgerador via the App Store, an Apple account is required.