Moving the Camera
Deliberately blurring a static subject puts your own stamp on a scene; the picture becomes about how you have moved the camera as much as the actual subject. Tree trunks lend themselves especially well to this treatment as it reduces the scene to its essential colours and forms. These two images were created in-camera. I started with a shutter speed of about a quarter of a second and, during the exposure, moved the camera either straight down, or sometimes with a little twist to create more texture.
Nikon D2x, 80-200mm, 1/4sec @ f/13, ISO 100 Niall Benvie
Nikon D3, 80-200mm, 1/8sec @ f/10, ISO 200 Niall Benvie