I TRIED COLOR NAME (colour if your are british mate)

new randColor[9] = {
    E60000, //Red
    1229FA, //Blue
    21DD00, //Green
    FFFF00, //Yellow
    F97804, //Orange
    00C2EC, //Light Blue
    38FF06, //Light Green
    008040, //Dark Green
    FF8080 //Light Red
};

getColorName(playerID) {
    new
        szName[MAX_PLAYER_NAME],
        szReturn[MAX_PLAYER_NAME * 3],
        randomColor;

    GetPlayerName(playerid, szName, MAX_PLAYER_NAME);

    for(new i; i < strlen(szName) + 1; i++) {
        randomColor = random(sizeof(randColor));
        format(szReturn, sizeof szReturn, "%s{%i}%s", szReturn, randColor[randomColor], szName[i]);
    }

    return szReturn;
}

public OnPlayerText(playerid, text[]) {
    new
        string[128 + MAX_PLAYER_NAME];

    format(string, sizeof string, "%s {FFFFFF}says: %s", getColorName(playerid), text);
    SendClientMessageToAll(COLOR_WHITE, string);
    return 0;
}