You can find a example book at this address:
The book was created from this spreadsheet:
(Note that the Google "key," "0Ag7PrlWT3aWadDdVODJLVUs0a1AtUVlUWlhnXzdwcGc" appears in both addresses).If you want to make a book, all you need is a simple three column Google Spreadsheet. Just put the words "image", "width", and "height" in the first three cells of the first row of the Spreadsheet (one word in each cell). If you want, you can also give your book a title by renaming the "sheet" in the first tab at the bottom of the page. You can use copy the spreadsheet example above as a template.
In the first column, paste links to image files on the web (the links should point directly to the image). If you need to upload images, there are a lot of free hosting options including Flickr, Imgur, and Google+.
Now, share the spreadsheet publicly on the web. [EDIT: Do this both by sharing the document publicly, AND by selecting "publish to the web..." from the file menu.] Once you've done that, copy the big long sequence of letters and numbers after "key=" through the hash (#). If you paste that on the end of this address:
You'll find your images have been turned into a book. The code itself is hosted on my GitHub account.
Leave a comment if you have questions/problems.