An FFGL effect that prints the frame instead of texturing it: four plates at their own screen angles, laid down by a press that never quite registers them. Rosettes, moiré, dot gain and overprint are all what four lattices and some ink do, rather than effects drawn on top.
This demo runs the plugin's shaders in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.