This WordPress plugin allows site visitors to change the active style in the K2 theme.
This plugin is the equivalent of a theme switcher for styles applied to the K2 theme. It allows your visitors to re-skin your site from a list of K2 styles that you select.
The default K2 style to be applied to a given post or page can be specified using a parameter added to the URL, post or page meta data, or an overall site default.
Style selections made by the user are persistent for the duration of their visit and override default values, however they can be overridden using a URL parameter.