Micro update
Edit-(Every color from the mushroom pack is also available for the eyes, if you wanna run around as a zombie with pink eyes.... well... that's your choice to make
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I finished all of the color variants and took some shots of a few I thought turned out pretty nice. They even work on non-zombie heads! Ah the benefits of modular building...
Anyway, if these seem kind of bright and hard edged, well they actually read really well from a distance (which is important in games!) you can probably see them from across the map!
The blue eyed one is a good example of how the eyes blend in at only a short distance away...
I was considering also doing "pulsing" eyes that fade in and out slowly, but doing multiple colors would be an issue as it would just take double the models and textures to make this possible for every color.
However, I could do the more popular colors this way, I don't see why not.