I had a pile of old photos that I picked up in a fleamarket in Paris nearly 4 years ago, and worked them into my 'hats and ears' sketchbook - an old exercise book that I'd actually painted and prepared the pages ready to work into about 16 years ago...I've no idea why I do that!! I think because my material tends to be 'found' or 'rescued' I'm very aware there are no copies, and when I use them I've got to be sure it's for the right piece. But 16 years...that's crazy!