Such a smart idea (feed old book pages through a printer to make unique silhouette art). Not gonna lie, I'd probably scan in the old book pages first, and use the scan for the final print. I love my old books, I don't want to cut them up.
Self Portraits? Divide the page into 6 squares and paint each one a different colour. When dry experiment with different prints on each square. Children draw themselves with a sharpie, then cut out and stick over printing.