FOR HAVING A BACKGROUND CHOOSEN BY YOU ON A FOLDER ON WINDOWS VISTA: 

A. install  Visual Studio 2005 SP1 Runtime Files: http://www.microsoft.com/downloads/details.aspx?familyid=200b2fd9-ae1a-4a14-984d-389c36f85647&displaylang=en

B. install freeware program AVE'S Vista Folder Background on  http://mpj.tomaatnet.nl/vista/ 

1. take permission as an administrator [of the system,] to the install file.(with right clik and select Run as administrator)
2. ... make a notepad file with this writting inside 

[AveFolder]
IconArea_Image=walla.jpg ; the image to use as background
ShadowedText=1 ; if 1, the text will be shadowed with icon style (must use a 
; bg image)
textR=0 ; red-component of the text-color
textG=0 ; green-component of the text-color
textB=0 ; blue-component of the text-color

; (textR=0, textG=0,textB=0) is black, (textR=255, textG=255, textB=255) = white

and save it with name : desktop.ini     
and put it to the specific folder you want change  the background. 


  
1.save the images i have made (details mac lines blue,list mac lines blue etc) to C:\Windows\Web\Wallpaper
2.copy the    desktop.ini  details  notepad file to the folder you want to change background.
3.then open it and set the name of the image background -------------------- as:
IconArea_Image=C:\Windows\Web\Wallpaper\--------------------------.jpg
for example i set it as  IconArea_Image=C:\Windows\Web\Wallpaper\list mac lines blue.jpg
4.after save the desktop.ini  details notepad file as :desktop.ini
5.close and reopen the the folder you want to change background.