Telling Folders – Customize Your Folder Icons
Telling Folders 1.0 is a free application for Leopard that allows you to easily customize or change your folder icons. You can drag and drop any image on top of your current folder icon. QuickLook is supported, so you are not limited to just images. If you accidentally change a folder icon, full Undo support is included in the application.
Get it HERE!
(Via Cool OSX Apps)