I had a 2007 calendar with some awesome microscopy images, which I refused to throw away the calendar with the dream of hanging up the cool pictures. Thanks to birthday money from Grandma and Grandpa (thanks!) and the vision of Chad, look at our cool living room art!
The images are of different materials, blown up to the ~5 micron scale. Of course, no scalebars. But a girl can't have everything she wants.
I would rate this as slightly less geeky than a kitten named Entropy, but only slightly. :)