The other option is to have glass eyes made with all the various things on them: a zebra-striped one, a cat one, one with a thin vertical-football-shaped pupil, an opalescent one, one with a 3D star-speckled nebula suspended inside a transparent sphere (with battery-powered mini-LED illumination), etc. You could also have the assorted emojis on those, as well. I mean, patches can only go so far (though the above video does push boundaries on that).