Liferay 7 Theme Switcher module
This module is used to dynamically automatically switch themes from one to another, based on a user's roles.
The goal of this module is to facilitate the creation of themes that don't depend on Liferay's in-context edition controls.
Deploy the module's OSGi bundles in your Liferay instance
How to use the module
Configuration of the theme switcher is site-specific. To enable the theme switcher on a site, open Liferay's product menu (the left bar) and go to Configuration -> Theme switching
Once in the configuration panel, enable the switcher. You will also have to choose which roles will trigger a theme switch and which theme will be used when automatically switching.