I am trying to follow http://primefaces.org/themes to get it working.
All community themes are also available in \"all-in-one\" package.
It seems repo is temporary broken, so you have to download it manualy.
Here is how to do that: How to download HTTP directory with all files and sub-directories as they appear on the online files/folders list?
wget -r -np -nH --cut-dirs=3 -R index.html http://repository.primefaces.org/org/primefaces/themes/
~/.m2/repository/org/primefaces/themes
dir