I had just finished a family portrait session last fall, and on my way home, I decided to stop out at St. John's University for a little more photography. These were all taken right beside the main road entering the college near the Vincent Court Complex.
You might be wondering how I took the images of the trees that look painted. I slowed my shutter speed and intentionally panned the camera, and in this situation, vertically. One gets lots of junk when doing this (I wouldn't recommend this with film). But luckily with digital, you don't have to worry about a lot of bad photos. You will get something you like, just stay with it.
If you want to try this with your camera, the key is that you need to be able to control the shutter speed on your camera. Even most point and shoots allow you to do that by selecting Shutter Priority mode. (Read your camera manual to find out how to set yours.) Your settings will vary from mine, but on this overcast day, I was at 1/15th of a second at an aperture of f/19. I was using my zoom lens, one of the photos was at 155mm and the other at 70mm. A longer zoom is more sensitive to movement, making it easier to create the motion blur.