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"Carbon Nanodiamond Particles Alter the Morphology of DPPC Monolayers" by Prajnaparamita Dhar
(mander.xyz)
This entry from the 2013 competition won first place, and in spite of its rather pixelated appearance, it is indeed fascinating, and visually intriguing! It was created by using fluorescence microscopy imaging, and shows "alterations in the morphology of Dipalmitoylphosphatidylcholine (DPPC) monolayers at an air/water interface due to extended exposure (8 days) to carbon nanodiamond particles. The images show discrete dark liquid condensed phase domains in a continuous bright liquid expanded phase due to interactions with the carbon nanoparticles."
...I couldn't have said it better, myself.