This is a character of mine, the Lava Leviathan. I originally 3d printed him, but then molded and cast in clear resin, and then painted in the areas I did not want to glow.

Here is a video where I used the model for an 'old school' style Ghostbusters effect: https://www.youtube.com/watch?v=5LkVkTmEA0o

Here is a link to a tutorial on how I mold and cast 3d printed objects: http://steakosaurus.com/?p=10