Here's a black, thermal mug adorned with the Green Lantern Symbol based on the hit, Green Lantern movie!  Oh, and now for the reason you're all here:  fill it with hot liquid and watch the symbol and mug emanate with green energy!  Right, it's one of them thar color changin' mugs!  That is just so Kool and the freakin' Gang!  It's like....having a little of that Green Lantern power without having to actually be a Green Lantern!  YEAH!  I knew there was a workaround somewhere!  Oh, and just to let you know-

This Mug is NOT dishwasher safe, nor is it Microwave safe, so...hand wash it. Put hot liquid in it, NEVER boiling. There, now I think you can safely use this Green Lantern color changing mug!