Fire up the intervalometer, put the camera to focus to nearbylights, stop down a bit, put it in Av mode, start spinning the camera like a YoYo using its strap (I am not resposible if you break ur camera.)
(http://farm9.staticflickr.com/8214/8298770563_b2f6a2a577.jpg) (http://www.flickr.com/photos/ashok_sahoo/8298770563/)
Abstract (http://www.flickr.com/photos/ashok_sahoo/8298770563/) by ashok_sahoo (http://www.flickr.com/people/ashok_sahoo/), on Flickr
Very original and creative.
Fantastic result.
I will try your method.