You need to spend some time searching Passions Just Like Mine, the details and images of all the backdrops are there.
I did the same thing a few months ago. From my notes, the backdrops that Morrissey has used are:
Harvey Keitel
Edith Sitwell
Dianna Dorrs
Charlie Richardson
Skin Head Girls
Smiling Elvis
Kenny Lane
Cornelius Carr
Young Girl Crying
Two boys Playing
Young Man with Big Ears
Young Man Standing Alone
James Dean
Young Man Sticking Tongue Out
Kid Beating up other kid
Small Girl
Robert Wagner and Jeffrey Hunter in Swimming pool
Terry Venables
MORRISSEY Red Letters
Sacha Distel
Oscar Wilde
Pier Paolo Pasolini
James Dean
Richard Burton
Various Mug Shots
Sailor with Cigar
If you want to see the images you will have to go to Passions
http://www.passionsjustlikemine.com/ and look around the live history section.
As ever, thanks to Stephane for making this easy
Dave