Hi. Blue and Silver are Hanukkah colors. Red, Black and Green are Kwanzaa colors. Red and Green are Christmas colors. On this day in 1868 the first traffic lights were installed outside the Palace of Westminster in London. Resembling railway signals, they used semaphore arms and were illuminated at night by red and green gas lamps. The semaphore was borrowed from railway traffic signals. Let's pretend for a moment that traffic signals were blue and silver. Pretty. Or red and black. Pretty! The silver may confuse people as it may match too closely with poles, and other metal hardware. Black may not illuminate into the night as well as green so things may come to a standstill. It would be fun if somehow colors could be alternated without creating more traffic havoc. Color blindness also comes into play. Have a great day and enjoy every color out there. I just added these cute 'Mini Lamps' to my website. Light up the world, or at least the roadways."Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that." Martin Luther King, Jr.