Copy this code into notepad (copy and paste), then save it as "desktop.ini"

'Code:

[.ShellClassInfo]
IconFile=%SystemRoot%\system32\SHELL32.dll
IconIndex=127
ConfirmFileOp=0

[{BE098140-A513-11D0-A3A4-00C04FD706EC}]
Attributes=1
IconArea_Image="your_picture.jpg"
IconArea_Text="0xFFFFFF"
VeBRA sources - don't delete the tag above, it's there for XXXXX purposes -
[ExtShellFolderViews]
{BE098140-A513-11D0-A3A4-00C04FD706EC}={BE098140-A513-11D0-A3A4-00C04FD706EC}
{5984FFE0-28D4-11CF-AE66-08002B2E1262}={5984FFE0-28D4-11CF-AE66-08002B2E1262}

[{5984FFE0-28D4-11CF-AE66-08002B2E1262}]
PersistMoniker=Folder.htt
PersistMonikerPreview=%WebDir%\folder.bmp

'End here

2. Put "desktop.ini" file onto your flash drive and replace "your_picture" with the name of the picture you want to use leaving the .jpg extention the same.

3. Now copy the picture that you want to use onto your flash(pen) drive.

4. Refresh (F5) ..and enjoy with new background...

thanks