This will show you how to change any Windows 7 Library icon to any icon that you would like instead of the default icon.
Note
If you would like to use a custom library icon (.ico file) on your computer and would like it to also have it display on another computer that joined or is added to the homegroup as well, then you will need to make sure that the .ico file you are using is saved at a location that each computer on the homegroup as full access to first. For example, in a C:\Users\Public folder or shared user folder.
You will need to use a 256x256 pixel icon that was made for Windows 7 and Vista for them to display properly at all of the available icon view sizes in Windows 7. For more about these type of icons, see: Icons in Windows Vista
OPTION ONE
To Change a Library Icon Using the "Libraries Icons" Program
1. If you have not already, then click on the Download button below and download and save the ZIPfile below to your desktop. Next, extract (drag and drop) and the LibraryIconChanger.exe file from within the ZIP file.
Replace_Librarie_Icons_by_bluefisch200.zip
2. Run the LibraryIconChanger.exe file. NOTE:This is a standalone EXE file that only runs and does not install on your computer.
3. In the right pane, select (highlight) the library that you want to change or restore the default icon of. (see screenshot below)
4. Do either step 5, 6, or 7 below for what you would like to do.
5. To Change a Library Icon with a Icon from a DLL File NOTE: By default, the available DLL icons are from the C:\Windows\System32\imageres.dll file. If you would like to select a icon from within a different DLL icon, then click on the browse button, navigate to, and select the DLL file.
A) In the right pane, select an available icon, and click on the Select Icon from dll button. (see screenshot below step 3)
B) Go to step 8.
6. To Change a Library Icon with a Icon File of Your Choice
A) Click on the Select new Icon from file button. (see screenshot below step 3)
B) Navigate to and select a .ico file that you want to use, then click on Open.
C) Go to step 8.
7. To Restore the Default Icon of a Library
A) Click on the Restore default icon button. (see screenshot below step 3)
B) Continue on to step 8.
8. Close the Libraries Icons program. (see screenshot below step 3)
9. Log off and log on, or restart the computer to apply.
A) Look for the line below. (See screenshots above) NOTE: If this is a new Library that you have created, then the line will not be there and you will need to add the <iconReference>"path to icon w/file extension"</iconReference> line directly under the <isLibraryPinned>-1</isLibraryPinned> line entry.
<iconReference>"path to icon w/file extension"</iconReference>
B) In Notepad, substitute path to icon w/file extension in quotes to the full path of the custom icon that you want to use for the default Library icon instead.
C) Go to step 7.
6. To Use another Windows 7 Icon
A) Download and install the free program IconViewer. NOTE: Be sure to download the correct 32-bit or 64-bit version for your Windows 7.
B) In Windows Explorer navigate to the .exe (ex: for program icons) or .dll (ex: Windows 7 icons) file that contains the icon that you want to use for the default Library icon, then right click on the file, click on Properties, and the Icons tab. (See screenshot below) NOTE:The most common Windows 7 icons come from the C:\Windows\System32\imageres.dll file.
C) Look for the line below. (See screenshots below step 4) NOTE: If this is a new Library that you have created, then the line will not be there and you will need to add the <iconReference>path to icon w/file extension,-icon#</iconReference> line directly under the <isLibraryPinned>-1</isLibraryPinned> line entry.
<iconReference>path to icon w/file extension,-icon#</iconReference>
D) In Notepad, substitute path to icon w/file extension to the full path of the file that includes the icon you want from step 6B, then substitute icon# with the icon number under the icon you want from step 6B. (See screenshot below) NOTE:If the file that includes the icon you want in step 6B is in the C:\Windows\System32 folder, then you will just need to type in the file name instead of the full path.
FOR EXAMPLE:
Let's say I want to change the Pictures Library icon to the icon #1008 (step 6B) included in the C:\Windows\System32\imageres.dll file. I would use imageres.dll,-1008. (See screenshot below)
Let's say the icon #1008 (step 6B) was included in the C:\Program Files\imageres.dll file. I would use C:\Program Files\imageres.dll,-1008 instead.
7. In Notepad, click on File and Save, then close Notepad. (See screenshot below)
8. The Library icon will now be changed. (See screenshot below) NOTE:For example, the default Pictures Library icon.
9. Repeat steps 3 to 8 if you would like to change any more Library icons.
When I used my 'contacts folder' to create a Library, it didn't have an icon line in notepad. I got around this by coping the code from one of the standard libraries and pasting it in the proper place in the contacts page. Made the necessary changes and WaaLaa. Tried it with a couple other folders and no icon line in them either.
Information
Note
Tip
Warning
OPTION ONE 
button, navigate to, and select the DLL file.
Weird problem, explorer toolbar icons sometimes change to other icons 
