A theme incorporating Twitter Bootstrap CSS.
To work on 2.3 and later, forked in Feb 2014 here:
2012 version available at https://github.com/reubenmallaby/redmine_bootstrap
Homepage (dead at June 2014) http://redmine.mallaby.me/projects/redmine_bootstrap
Install as a Redmine plugin rather than a theme as a number of Redmine views have to be overridden.
Currently compatible with Redmine 2.1+ using jQuery.