I think you may be able to do that w/o the addon.
If you have Font Awesome enabled for your theme ( which means in your themes index.template.php file you have 'require_font-awesome' => true, in the template_init function )
Then you should be able to add in some HTML like <i class="fa fa-folder"></i>
which will show the folder icon where you place that code. Pick whatever icon that is available with FA.
PS Nice you see you, hope all is well !