PyBlosxom, the server that runs this site, supports flavours. They change your PyBlosxom site's appearance, using templates, CSS, images, and other files, without changing its content. There's a longer description on the PyBlosxom site.
The snarfed.org flavour is available for download.
To try it out on your site,
download snarfed_flavour.tar.gz and copy the
contents of datadir/ and flavourdir/snarfed.flav into your PyBlosxom's
datadir and flavourdir, respectively. Then, edit config.py and add this line:
py['default_flavour'] = 'snarfed'
This flavour is licensed under the
Creative Commons.