FolderHighlight

FolderHighlight screenshots

Changes the colors of the folders' icons in Windows
Customized Folders
FolderHighlight 2.6 : Customized Folders

Alternative downloads

FolderIco Cats Icon Pack
It allows you to change the folder icons into cats icons.
2.0
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Folder Icon Changer
A tool to customize your files and folders by changing their icons.
5.3
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Folder Marker Pro
You can mark important folders with color-coded or image-coded icons.
4.2