You can change the default font name, colour and style of any folder in the Navigator. You also can change the icon to a more descriptive one that best suits your needs.
doogiePIM allows you to change various visual properties of a folder item, such as:
See Changing a folder's font and colour for more information
Moving and Sorting Folders
Changing a folder's icon
Changing a folder's font and colour
Adding, Renaming and Deleting Folders