So, the experiment with linen hankies has gone well (the machine sewn ones, the rolled hem one is still not done). I've cut a batch more but I think I'm going to embroider them.
Leaning towards elegant, white on white, BUT I think it's probably going to be things like "Gross" in fancy font, "snots" elaborately written, maybe a dribbly nose.
Given I'm dumping them into random w/m loads, the different materials (rayon/linen) might pick up dye bleed differently.