Nikon Small World

http://www.nikonsmallworld.com/

Top 100 Hubble images

http://www.spacetelescope.org/images/archive/top100/

Top 100 Hubble images

http://www.spacetelescope.org/images/archive/top100/

Fractal bacteria colonies

http://star.tau.ac.il/~eshel/gallery3.html

Escher

M.C. Escher: More Mathematics
Than Meets the Eye

Animal camouflage

http://conservationreport.com/2008/11/08/can-you-see-me-animal-camouflage-leaf-mimics/

Striped iceberg