I had looked at this since I have a little one, and was thinking this idea would be cool instead of going full on rear captain's chair. Not something I would do with my current van, but still the thought had crossed my mind and by the time I get the next van, he will probably like to sit in back in a captain's chair better anyway.
When I was thinking about it I found these Ford center console seats and they fold down for an arm rest center console when not a seat.
Edit: Damn, Elltom beat me too it!!