I would very much like a red glowing eye option for Orcs, to symbolize their savagery and demonic corruption, like Grommash had in this Wacraft 3 cutscene:
I know it doesn't make sense after Grommash freed the Orcs from Mannoroth's control. But, it would still be awesome for roleplaying.
Besides, there are still Warlocks among the Orcs, and as Gul'dan shows, they have red glowing eyes.