My favourites are the mexican blacks and the speckleds. Mexis are some of the smaller kings and mine had a very good temperament, better than most cali kings I woud think.
Speckled kings are larger - I havent kept them so am unsure on temperament but I quite like their more robust size.
Dont have any piccies sorry, hopefully someone else will post of few of theirs
a speckled was my first ever snake, i was a bit weary of it at first as it seemed to strike at everything also i got a book on kings and it said they were a tad more agressive than any other kings.
havent had any other king since so i wouldnt know how true that was. im more into my boas