I have only used them on the wall....but that may be a cool idea
I don't think they'd be acid free though so careful by your original photos...
(Wallies are individual 'die cut' wallpaper pictures/motifs you can put up on wall just by wetting & smoothing with a clean sponge.
They are sold at craft stores/home improvement come in packs of abt 10 I think of same image - LOTS of varieties - Hey there are some cute ones that you could make paper piecings from for scrapbooks....)