Can we be flexible about the phrasing of the theme? That is, do they necessarily have to have two parts to them (like a cryptic crossword puzzle clue)?
As an example, I was thinking of what to me is a great book title, The View in Winter - a non-fiction book by Ronald Blythe, of elderly people talking about their lives. So a phrase like that could refer to old age, or of course to a story with a winter setting. I don't think a phrase like that needs anything added to it.
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