i do under stand why u are asking as you do get some single minded people who moan that everything should be painted as per codex. but if we are going to say that then shouldnt everything be painted to to eavy metal standards, NO i dont think so.
i agree that for some people looking down and seeing nicely painted models helps them to enjoy the game and helps them imagine there flesh being torn apart all that much more easily a also agree that the people who spend time an effort making there army look at least prety good for this purpose shouldnt be let down by people who cant be bothered.
as has already been stated there is no law against people painting your army whatever colours you want and if you are worried about people saying stuff to you and dont just want to tell them to shut up, you could always spend some time making up some backround fluff for your army.
i will say this though whatever colour you paint them they will always be heretic SCUM!!!
"just to clarify, im not the Fonze"