I'm an avid scrapbooker, and I was very disappointed in the slim offerings onboard. They had 2-3 packages of general Disney scrapping materials. Personally, I never buy packages of scrapbook materials. I find that I always use about 1/3 of the stuff, then I end up giving the rest to my kids for play. It isn't worth it. None of the materials were specifically cruise-oriented -- they were more like stickers of Mickey and friends.
They had small "slide your photo in" type books, but no scrapbooks styled like Creative Memories, Pioneer, etc.
I found MUCH more stuff in Downtown Disney last summer.