How about old, new, borrowed, and blue?
ETA: and how about a picture of a bride in a bridal gown even if nothing in the title?
Sorry for the delay in answering.
This had come up before & that's how BLUE got in there.
So, following that theme, "old", "new" and "Borrowed" are also fine.
No for pictures or romances. I did that one year, but then changed to a word list to make it easier for the non-romance reading folks to participate. Pictures are often done by secretariat in her NJABBIC challenge, and the romances are done in February. Maybe PM Secretariat and suggest any wedding type pictures you might want to have a theme for? She's always looking for mystery namers and suggestions.