Copy the following to your text editor and save it as desktop.ini in the folder whose background you want to change.
iconarea_image="complete picture location"
iconarea_text=0x00000000 <------- File text color can be set to any value
just now its black.
0x00ffffff for white.
Run the following command in the command prompt
attrib +s "path of the folder"
e.g. attrib +s "E:\old download" will change the background of the folder "old download"
It would be good to keep the file desktop.ini hidden.
So right click on it __ go to properties __ change its atribute to hidden. done.
This is the amazing trick. isn't it?????