Download some free "Unseen Lithuania" desktop backgrounds. Choose the picture and the screen size, wait while the photo opens up and right click the mouse to select "Set as background" (or similar menu item according to your web browser).
 

   800x600
   1024x768
   1280x1024
   1680x1050

   800x600
   1024x768
   1280x1024
   1680x1050

   800x600
   1024x768
   1280x1024
   1680x1050
 

   800x600
   1024x768
   1280x1024
   1680x1050

   800x600
   1024x768
   1280x1024
   1680x1050

   800x600
   1024x768
   1280x1024
   1680x1050