I don't have any artwork but a catchphrase for a G&FH SE ad on the GIS Stack Exchange could be:
Where's your ancestry?
Over the past 10 or so years the GIS industry has made a concerted effort to "own" the word "where" and so it would help associate the subject matter of the two sites.
With Family HiStory Mapping being a focus of mine I would love to see more GIS Professionals taking an interest in Genealogy & Family History.