Portraits of Hogwarts Founders

[macfotuk at yahoo.com]

No: HPFGUIDX 112089

usual excuses about hope this is an original idea (and fears that it 
isn't, so apologies in case!):

I know it was a really, really lomg time ago, but why aren't there 
any portraits of Godric Gryffindor, Salazar Slytherin, Helga 
Hufflebuff and Rowena Ravenclaw? is it just convenient for JKR that 
there aren't? Yes, it was a long time ago and there are no 
portaraits of King Arthur etc, but even so... many portaraits of 
ancient and venerable headmasters exist, so why not the founders?

Also for the SHIPper's two males and two females among the founders -
is this just year 2000+ PCness or - any SHIPs here? (I see no ships 
said the pirate cap'n).