You can't go wrong with vintage children's books. Really, you can use them for anything and they're often very affordable. My friend Mandi gave me the one pictured above, so I can't say if it was still 29 cents (see price at top right corner of cover), but I bet it was close. The book pictured below cost me $1.00. At those prices, I find them very hard to pass up.
So, how to use them? How about...birth announcements (I've done this 3 times-once with the little drummer boy above), party invitations, gift tags, decoupage projects, collage art, scrapbooking, framing (I framed two pages from the ABC book below), reading (!), decorating, and the list goes on. For many of these purposes you'd want to scan the images first and then play with the newly printed pages instead of destroying a great old book that you could use again.
And here's a site for downloading entire vintage children's books: The Rosetta Project.