Andrew, I love this effect and have made a few presets that start with the black lines. Works really well on reptiles and birds too. I like the way it makes this old boy look. Hope you have a great trip and bring back some more cool images!
Dan, you can see what the "line creation mode" buttons (just to the right of the "radius" sliders) do in Fractalius by selecting the "Reset All Settings" at the bottom of the panel and then clicking on them. When the lines of the buttons are white, you get the familiar white fract highlights. When the lines on the buttons are black, you get black highlights. Sure wish there was a manual for this thing though...
