Seasprite

Contrary to what you might have been expecting - perhaps some delicate aquatic creature, or a type of magical fairy - the Seasprite is actually a big hunk of metal. Drat. 

As usual, Ralph Savelsberg (Mad physicist) has knocked it out of the park with this build. According to Ralph, the UH-2A Seasprite was used by the US Navy as a utility helicopter and a plane-guard helicopter for aircraft carriers. I'm a big fan of the bright contrast in colors (that orange is one of my favorite colors!), as well as the techniques used to create tapering slopes and the greebles used in areas like the landing gear. 

It looks like Ralph also managed to include a sliding door and retracting landing gear, which adds a nice bit of functionality to this excellent display model. 

13-piece plane

When you're building with only a tiny handful of parts, every piece counts. As far as I can tell, this Fokker D VIII plane by Karf Oohlu uses only 13 pieces, 14 if you count the 6x6 tile base. But even at this scale the model is still easily recognizable, and is full of details thanks to the minifig guns, 1x1 cylinder with "wings," and Batarang (!).