Comment 13 for bug 1362555

An interesting observation:
 * /usr/share/themes/Lubuntu-default/gtk-2.0/apps/lubuntu_lxpanel.rc specifies the use of the image with bg_pixmap, while xfce4-notify.rc uses a plain bg.
 * If you remove the png, lxpanel still appears to use it. Notifications will have a black background.
 * If you change lubuntu_lxpanel.rc to specify a color instead, it will use that (you have to `lxpanelctl restart). Still black backgrounds for notifications.
 * If you make any changes to xfce4-notify.rc, none of them will have any effect.