I nearly lost my shi...stuff with this guy's Microphotography. There are loads of really good ones but here are some of my favourites and here is a link to the whole website. It's worth a gander, if your patient. I don't even know what half of them are microde up of but who cares, huh, when they are so pretty.
Caffine crystals melted with Vanillin
Hyroquine, Vanillin and Estrone melted together and crystallized
Cross section of Rununculus root
Cross section of a Huckleberry plant bud
Testosterone & Estrone melted together and crystallized