The build below is the largest spaceship that I have showed to date (though as a sneak peak--there is a bigger one waiting in the wings for the next in-person Bricks by the Bay convention).  This one was done in the style of the LEGO Space subtheme, M:Tron.  This ship featured LED lights in the engines.  There were quite a few trans-green pieces highlighting the engine "cores" and backlit by the LEDs.  At Bricks by the Bay 2014, this ship won the "Spaceship, Spaceship, Spaceship" award.  Anyone familiar with the LEGO movie will get the reference.