Those are actually very easy to make. You just float oil-based inks on water, using a stylus or a comb to make the traceries (and clear oil or water drops to ma

Those are actually very easy to make. You just float oil-based inks on water, using a stylus or a comb to make the traceries (and clear oil or water drops to make the voids); transfer to the paper is almost immediate and almost total. Marbling's been around for a very long time.