I made this Halloween cake last year for a good friend who throws a big Halloween party every year. The theme of the party was "Glow in the Dark"! The eyes of the skull are LED lights that were wrapped in cling wrap and placed in the eye sockets then covered with a fondant eyeball cover. I had tried to make the bubbling brew in the cauldron glow as well using tonic water but it only had a slight glow under the black lights. TFL!