Figured I’d “Show, Not Tell.” I did this carelessly in about five minutes, so those eyes could look a lot better if centered in the pupils properly, which mine aren’t. They are transparent plastic tubing, so they don’t look so much like drilled-out LED’s, but more like glossy vacant pupils. The LED hangs loose at the back, so you could switch out other colors too. (The last pic is the "plan," showing the tubing outside). My ambition wasn’t just to duplicate a Superman head but maybe set up other cool stuff. Notwithstanding she's in the pics, I’m not about to risk my TBL Kier to give her green eyes. Before anybody says anything, I'm just displaying a concept -- people with better skills than mine could carry it off much better.
The light tubing and LED pack come from an Hex Bugs Junk Bots kit, that is at $5 “Clearance” right now (and also included other neat stuff, like the radio and Mini-Cam, that I put in the pic so you can see how they originally intended the light tubing to be used).