Aquatint Etching effect

Hi,
Does anyone know how to achive an aquatint etching (example by local artist @ www.peterhickey.net , just click on ‘etchings’) -like effect in renders?

those look do-able, if you start with a photograph, go thru a Color to BW node to get the grey scale, then either a mapnode and/or colorramp to flatten the colors/gradients, and then the comic-book effect to introduce his pixelation for the backgrounds.

Thanks! It may not be do-able in GIMP, but I’ll try…

GIMP? I was talking Blender composting nodes. sorry. yes, GIMP does have lots of filters, but if you wanted to make a commercial/video with that look…Blenderize it!

Oh, I see! Thanks! Which node is the comic-book effect node?