Ah Slynky, I was pulling your leg, man! I wasn't being
pissy; I was making a joke about the quality of Sigma
zoom lenses in general ("performance hasn't degraded"
from new). That self-portrait was a mock-up done with a
cotton ball stretched over the lens of my digital camera.
The color effects were done in the Gimp: decompose image
into CYM components, motion blur each component at a
different angle, then recompose the image.

Heh! Sorry if you misunderstood. I figured you'd be tipped
off by the speed with which I replied (2 hours).