I was just in the tetons recently photographing fall color on a Great American Photography Workshop. After we shot the classics we tried some more abstract ways of documenting color. One of my favorite techniques is twisting the camera while pointed upward to get some pinwheel effects. Shutter speeds from 1/30 and slower will get good results, it just depends on how fast you can twist. Also try zooming in and out on a zoom lens during a long exposure for more interesting effect.
Tech: D300s, 24-70mm, ISO 100, F22 at 1/25.