I guess I shouldn't be surprised, but it appears I am not the only one who has thought of using original images from the period to illustrate a story about the 1920s. I've mainly focused on finding images to represent my characters, but Caroline Preston's The Scrapbook of Frankie Pratt sounds like it uses the images to illustrate the entire story.
Unfortunately this one isn't available in ebook format, probably because of all the images, or I would have bought it on the spot. As it is, I put a hold on it from my library, but I'll probably look for it in Barnes & Noble next time I'm there. I'm interested to see how the author and publisher handle the illustrations, and whether the novel is mostly pictures, or text, or an equal combination of both.
However the images are handled in Prescott's book, I have to say I was very interested — not to mention delighted — to find that I'm not the only one who has thought of using old images to enhance their fiction!