So here's a thing:
This is a technique I saw somewhere and thought I'd give it a shot. The base on which these are painted are small glass bezels, about an inch and a half in diameter. Everything is painted with metallic shades of nail polish on the flat back. Start with the pupil and the dark rim; I used a pin to spread out the polish for the pupil in that more crazed pattern. Then paint on rings of colors coming closer and closer to the center, alternating with scraping lines radiating out from the center with the point of a knife.
These came out nicely, I think, but I have no idea what to do with them. Maybe find some temporary adhesive and put them on Osric.