This was just for fun and I have to admit it looks nice in the display case.
This is an insert for the Masterpiece Soundwave Energon cube to emulate the glowing effect seen in the G1 cartoon.
It is equipped with a reed (magnetic) switch so you can turn it on and off without having to open the cube and mess with the papercraft insert.
http://youtu.be/kl_sxLA31Yc
http://youtu.be/ZxxPP7GajOo
If anyone is interested in making or purchasing one, PM me.