This is a git repository reproduction of the theme detailed at http://blog.justin.kelly.org.au/octopress-theme/ with a few changes.
See https://github.com/imathis/octopress/wiki/3rd-Party-Octopress-Themes for more themes.
$ cd octopress
$ git clone https://github.com/wallace/justin-kelly-theme.git .themes/justin-kelly-theme
$ rake install['justin-kelly-theme']
$ rake generate