This theme, lights-on-bridge, is designed that the the left side has dark blue color, so that the status and menu bars have this dark background. This has nice effect with light fonts. To the right there is the illuminated bridge with flowing traffic with golden reflexes and red backlight streams of the cars.
lights-on-bridge was easily and flawlessly installable via the add-on site of mozilla.org. It was used since 9 months in several applications (i.a. Firefox, Thunderbird) and several computers. I will gladly continue to use it.