Sankara Shrine build an artifact, some wax paper, aluminum foil, bubble wrap and a tea light. I saw a video on youtube from Scott's toybox where he used some aluminum foil to line the top part of the shrine. He then nestled a tea light in some bubble wrap within the back while using some wax paper as a diffuser over the inside of the front part of the eyesockets.

It makes it light up, the stones already glow in the dark, but the light up effect is pretty spookey!