This was my first really big project I built when the creative mode got available, it's the glowing cloud of a nuclear bomb's explosion. Don't think I'm one of those war freaks, I just think this mushroom clouds are very disturbing and impressive.
Here you get the skin seen on one of the pictures:

http://www.planetminecraft.com/skin/nuke-562119/

The texture pack used on the two last pictures is a customized version of the Last Days pack.