And, in the latest Scientific American on line there's a scanning electron microscope slide show by University of Georgia digital media professor, Michael Oliveri.
For another view of things small see SnowCrystals.com.
The 4th plate from Ernst Haeckel's Kunstformen der Natur (1904), depicting diatoms (Diatomea).
Here's a gratuitous image, possibly tube-shaped like the nanotubes, from my sinusoidal grids project:
Bourzac, Katherine (2009). "Growing Nanotube Arrays", MIT Technology Review online, March/April, 2009.