What Would You Stick Under A Scanning Electron Microscope?

Here's some tasty-looking hard candy. And here's that same tasty-looking hard candy scanned by an SEM. Tuns out that there's a company offering to stick almost anything under an electron microscope and we can't help but wonder: What to pick?

SEM Elemental Analysis company ASPEX is offering this great service where people can submit their own samples to be viewed under a scanning electron microscope. They even post results—like these—on the site:

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Now, back to the big question: What would you want to see scanned by an SEM? [Aspex via Maria Popova]