Neuromorph.org is a website with a huge database of neuron morphologies, which can be downloaded in the SWC-format. As I wanted to display those neurons in Blender and could not find any importer, I wrote a small Python script that does the job for me. I thought it might be worth sharing this script just in case anybody else wants to use Blender to display and render the morphology of realistic neurons.
Update 27.05.2015:
The script is now available at Github.