Colour Inspiration

I am really inspired by the colouring of vintage photographs and i would like my photographs for my book to be of a similar tone and colour. I really like the sepia tones and duotone colour schemes that they produce and i think this is reminiscent of simpler times when there were no colour photographs, also i think using duotone photographs would give my book a simpler classic look that would appeal more to my audience of mature adults who are looking for inspiration to simplify their lives.