I have a habit of collecting pictures from discarded magazines (especially National Geographics) left over from the days when I wanted to be an illustrator, and was building a scrap file for visual reference. Recently I went through my shelves and pulled out a bunch of books that had no dust jackets:
Then I dug through my scrap file, collected some pictures, and gave these books new faces. It was fun, and they look much nicer now (I think)! I clipped the photos out of dozens and dozens of magazines, so I have no idea who originally took them, but I'm not going to make any profit off them, so I don't figure I'm breaking any copyright law. Any more than decoupageing a lampshade with clippings would be. And if for some reason these books ever left my library, I'd remove the covers I made, first.