[HarryT]

I really can't think of anything except "flaming" that it could be! As you say, there are very few words that fit the letter pattern. Given that they appear to be talking about Valentine's cards, "flaming picture" would seem to fit the context.

My Chambers dictionary gives "Love or its object" as one of the meanings of "flaming". That's probably the sense in which the word is being used here.