[Neil.]

PHP код:

CMD:red(playerid, params[])
{
    SetPlayerColor(playerid, 0xFF0000FF);
    return 1;
}
CMD:blue(playerid, params[])
{
    SetPlayerColor(playerid, 0xFFFF00FF);
    return 1;
}
CMD:green(playerid, params[])
{
    SetPlayerColor(playerid, 0x00FF00FF);
    return 1;
}
CMD:black(playerid, params[])
{
    SetPlayerColor(playerid, 0xFFFFFFFF);
    return 1;
}
CMD:gold(playerid, params[])
{
    if(IsPlayerAdmin(playerid))//Specify your own levels 
    {
        SetPlayerColor(playerid, 0xFFB90FFF);
        return 1;
     }
    else return SendClientMessage(playerid, 0xFFFFFFFF, "SERVER: Unknown command.");
} 


This is just a sample

You can get some list of colors here : http://web.njit.edu/~kevin/rgb.txt.html
This uses ZCMD btw