The clue is in the tags, though quaternions seemed likely: fractals and julia series. Image piXelero of Finland, on Flickr.
z[next] = (z+2.8i)(z-0.24-0.88i)/(z-0.24+4i)/(z+1.04+0.2i) +(0.166-0.4i)
While on the subject of spectacular visuals, here's one that is NOT static. In fact, it could be the very opposite of such. It uses WebGL. Surprise. Modern browsers only, please!