There are several ways to change the cover/icon of a folder.
I know of no way to change the white baackground of a window displaying the contents of a folder. Would be very interested
if someone does.
Easiest way to change the cover icon is to right click the folder and choose Properties>Customize>Change icon. You will then be able to
select from one of the many pre-loaded Windows icons or "Browse"
you computer to choose one of your own, including one of your pictures.
Is this what you were looking for?
i was woundring how do u change the background picture in my documents and other folders i used to know how to do it on the old windows but the option isnt there in windows xp