Vintage posters are very popular because they often evoke a memory and can contain amazing graphics and designs. Some are worth a lot of money if they are original and of a subject that is very well known and popular, such as movie posters. Many are affordable, fun and can mix in well with other period items in a scheme.
Victorian black and white photographs can be quite mesmerising. They are a window on the past and people are still fascinated to see how folk lived, worked and looked during those times. Later photography can be just as interesting and instead of just having a group of family photos on a wall, you could create an interesting alternative display of people, places or subjects not related to you.