This note for myself but someone could find it useful. List of themes for Redmine i’ve used in my projects.
You can install Redmine User-Specific Theme Plugin to manage plugins from frontend
https://github.com/Undev/redmine_user_specific_theme
A1
http://www.redminecrm.com/pages/a1-theme
Basecamp-responsive
https://github.com/MartinSenovsky/redmine-basecamp-theme-responsive
Circle
http://www.redminecrm.com/pages/circle-theme
Coffee
http://www.redminecrm.com/pages/coffee-theme
Highrise
http://www.redminecrm.com/pages/highrise-theme
Minelab
https://github.com/hardpixel/minelab
Pixel-cookers
http://pixel-cookers.github.io/redmine-theme/
Redmine-progressive-theme
https://github.com/stgeneral/redmine-progressive-theme
Redminecrm
Twisted Linux 