Introduced with release 0.9.11, your directories can now be represented by a "Cover Picture" within a frame and some information next to it. This feature is called "Directory Cover" and is dependand on the configuration directive directory_display_mode.

By default, every directory has no "Cover Picture" set, it'll just show a question mark instead. To set this "Cover Picture", there's two possibles ways. The first and most simple is to click on the frame's icon available next to every picture (only in admin mode). The second one is to use the select list in the "Directory Settings" fieldset. By using this select menu, you'll even be able to select a "Cover Picture" of another sub-directory and also remove the current one.