So this is a simple remix of a Minecraft cube, the only tricky thing is that I printed an internal piece out of glow in the dark PLA so that when it's energized by an internal light (blue LED) it gives off a cool glow. The cube model has also been edited to include small supports, so all you have to do is print and then use something to snip them off. Also this is designed to use a 1W LED along with some minor components and x3 AA batteries.

For full details (including circuit schematic) see muh blog: http://antdiy.blogspot.com.au/2015/11/project-glowing-minecraft-cube.html