Сделать сложный фон окна

procedure TForm1.FormCreate(Sender: TObject);
begin
  bm := TBitMap.Create;
  bm.LoadFromFile('Example.bmp');
end;

procedure TForm1.FormPaint(Sender: TObject);
var
  x, y: integer;
begin
  for x := 0 to Form1.ClientWidth div bm.Width do
    for y := 0 to Form1.ClientHeight div bm.Height do
      Form1.Canvas.Draw(x * bm.Width, y * bm.Height, bm);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  bm.Destroy;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Form1.Brush.Style := bsDiagCross;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Form1.Brush.Bitmap := TBitMap.Create;
  Form1.Brush.Bitmap.LoadFromFile('Phone.bmp');
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  Form1.Brush.Bitmap.Destroy;
end;