When Marie suggested an altered book for this challenge, I created a "digital altered book." It's a combination of images from two books on London--a Baedeker travel guide, and a book called "Londontown." The resulting book is superimposed on an image of an old London map. Since my maiden name is London, I'm drawn to digital images and ephemera relating to the city :).
Image credits: graphicsfairy, holliewood, artefacts.