Using Mac OS El Capitan, I changed some system folder icons in /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources to full-colour folder images. For instance, I changed ApplicationsFolderIcon.icns to put a full-colour image on it rather than a silhouette. These images do not appear in the Mac interface. That worked with Mac OS Snow Leopard, but not in El Capitan. Why are the folder images in there if they are not used, and where are the actual system folder images really located?