Lockets - inspiration

Picture locket brooches;

Some locket brooches are specifically meant to hold photographs rather than hair. These tend to have a large display area with little frame. Many of these picture lockets date from around the first world war when a lady would wear a picture of her favourite soldier.
Here is an Edwardian picture locket brooch which could hold a photo in both sides with the picture swivelling so that you can choose which side to display:

Love this concept, having 2 photos concealed inside a pretty frame in which you can swivel around to display whichever one you feel. Makes me think about double sided pendants, perhaps with photos on each side, or perhaps a photo on one side and some text talking about the photo on the other?