Inside the tunnel of an underpass, I decided to have some fun with the camera. For safety reasons, try this only when you are a passenger.
Set the camera's shutter speed to between 1 and 2 seconds. Click and rotate your camera during the length of the exposure. The rotation need not be a full or perfect circle. Your mileage may vary.
To make the light bluish at the end of the tunnel, change the white balance to one of the presets by pre-viewing to see which works best.