I knew I was going to be a little late for my morning meeting when I saw this while crossing the Conestoga River at Three Bridges.
These photos are a little different. They were all taken after the the sun had set on a moonless night with exposures between 15 and 60 seconds long. The only light is from the glow coming off Waterloo in the distance reflected off the snow.
One effect of using only distant city light for illumination is that you get a very narrow dynamic range. If you then expand that dynamic range in post-processing, you get some interesting effects.