K-Drone by Si-MOCs. This one's sick. It even has a carrier.
Sunder by Mitch. Great use of stickers and color on this one.
Mantis 1 by Paradoxboy. It needs a bit more secondary color for contrast, but this is a great build.
Hungers by Nikita Lazarev. Very Xenomorph-ish.
World Domination by A Plastic Infinity. Great color use and composition in this one. It even has a little bit of scenery for that undersea look.