10. To change the icon for a single folder

10. To change the icon for a single folder
 

Create a desktop.ini file -- in the folder -- that contains: [.ShellClassInfo]
IconFile={name and path of the file that contains the icon}
IconIndex=xx (xx = Zero-based icon # in file)
InfoTip={An optional description for the folder that displays in webview}

To change all folder icons:
Explorer > View > Folder Options >File Types > File Folder > Edit > Change Icon