I've been looking for some nicer "demon eyes" in 3DCG, and so when I couldn't find them I decided to make some myself for use in MMD (and PMD editor).
These come in 30 colors, and all of them have black eyewhites. They work best with 3DCG models. (When using other models, the eyewhites might still be white or the texture will turn out rly weird).
You can always recolor and edit them, but please give credit