[Страдалецъ]

Ну вот вам такой вариант:

Код:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormPaint(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    Pic: TBitmap;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
 Pic := TBitmap.Create;
 Pic.LoadFromFile('C:\DemoPic.bmp');
end;

procedure TForm1.FormPaint(Sender: TObject);
begin
 Canvas.StretchDraw(ClientRect, Pic);
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
 Pic.Free;
end;

end.