Ethan made this awesome costume using a PIXEL Guts kit with a 32×32 LED matrix. Using the low power firmware, he got over 9 hours off one 3500 mAH portable phone power pack.
He is able to see just fine and is looking right below the bottom of the LED panel with 2 inches of clearance with peripheral vision on the sides.
Ethan is also a pixel artist, check out his work at http://vilepixel.deviantart.com/gallery/
Instructions and parts for portable PIXEL here http://www.instructables.com/id/iBling-LED-Necklace/