Diamond Cameo–
A Diamond Cameo is when an arrangement of 4 portraits are used to make a diamond shape, they were all pictures of the same person who were often Victorian men at the height of their popularity.
A Diamond Cameo I made 
A Diamond Cameo made by Henry Mullins
I used Black and White images to try to make them all seem more uniform, as having them in colour could seem distracting from the subject.