Author: Misha Moellner 

Change your windows start button image

Answer:

1   { define Global vars }
2   
3   var
4     Form1: TForm1;
5     StartButton: hWnd;
6     OldBitmap: THandle;
7     NewImage: TPicture;
8   
9     { put the Code in the OnCreate event of your form }
10  
11  procedure TForm1.FormCreate(Sender: TObject);
12  begin
13    NewImage := TPicture.create;
14    NewImage.LoadFromFile('C:\Windows\Circles.BMP');
15    StartButton := FindWindowEx(FindWindow('Shell_TrayWnd', nil), 0, 'Button', nil);
16    OldBitmap := SendMessage(StartButton, BM_SetImage, 0, NewImage.Bitmap.Handle);
17  end;
18  
19  { OnDestroy-Event }
20  
21  procedure TForm1.FormDestroy(Sender: TObject);
22  begin
23    SendMessage(StartButton, BM_SetImage, 0, OldBitmap);
24    NewImage.Free;
25  end;