Ludovic Collin took this awesome confocal micrograph of a nerve cell for the Wellcome Trust Biomedical Image Award 2006:

A cluster of special nerve cells called cerebellar granule cells, growing in culture. These cells naturally gather together, and when placed in a culture dish covered in a particular protein, they start sending out long projections (yellow/green) as they would in the developing brain.

Link - via Cynical-C