I’m playing around with creating custom themes in iPhoto for the book feature of the app. If you did down into the proj file you find a Books folder, and if you dig down further you find a nib file for each page style for each theme. The problem I’m having is that the changes I make to the nib file aren’t showing up in the Application. However, if I remove the nib file, I no longer have the page template available. Is there some other step I need to do other than saving, like compiling the nib?

I solved my own problem. iPhoto does some processing and caches .ppd files for each page template in ~/Caches/iPhoto Cache. If you delete those, your changes will show up.