Every year, Electron, Ion and Photon Beam Technology and Nanofabrication (EIPBN) hosts a micrograph contest. This year, 86 entries were submitted. You can see all six prize winners and 10 honorable mentions here.
Here are a couple of examples:
The grand prize winner, submitted by Joel Yang and entitled 'Reading Tea Leaves':
Description: SEM image of M.C. Escher's 1948 Drop as "sketched" by e-beam lithography in such a way as to preserve the grayscale information.
Medium: HSQ on Si
Magnification (3"x4" image):3,300x
Description: Carbon nano-fibers on FEBID iron catalyst particle
Magnification (3"x4" image): 50000