I found out, that it is indeed possible to get a little birthday present if flying KLM. I assume this will work equally well for AF.
I was sitting in KLM Y the other month and the charming lady to the left of me got a little champagne bottle with a napkin around the neck with some writing a la "Greetings from the Crew".
Naturally I inquired what she did in order to receive that little present. Turns out her Sister is a KLM Stewardess.
And I have pics, so it happened.

are you going to post the pics here? sure hope so!