There's an interesting article by Nick Melidonis in the current issue of Better Photography magazine (no 67, p 94) on the artistic effect you can get with long exposures and deliberately moving the camera while taking the picture. It's a great way to simplify the image and emphasise colour and structure, well worth a read. Anyway, I thought I'd give it a try.
We too a trip to Mt Field National Park recently and took a walk to Russell Falls. I had my iPhone with me and had been using the SlowShutter app to take a long-exposure photo of the falls. On the walk back down the path I decided to try a long exposure while walking. The photo below is an 8 second exposure. All I did was try to keep the point where the path disappeared into the distance at the same place. Anyway, I was pretty impressed with how it turned out. A small amount of editing was done using another app called Filterstorm to increase the contrast a little and saturate the colours.
One of the great things about this is that because the idea is to use movement to make the picture, you don't need super-good camera gear. A small camera will do a good job too.