For a brief, glorious period of the late 1990s, Crayola's yellow crayon had an alter ego: "world wide web yellow." Purple was "www.purple" and screamin' green was "green.com." The 16 crayons of the "Techno-Brite" lasted for just a couple of years. But two decades later, they've become a viral snapshot of what the internet was like in 1997 - and just how much it's changed.