Nuevvo has just released Takai, the official K2 demo site, as a free Joomla!/K2 template, available for everyone to download and use.
This new iteration of the demo site has been fully modernized to be responsive, uses multi-color variations (with the option to create yours as well), is built using flexible grids, features cool off-canvas navigation (when on mobile) and uses Nuevvo's awesome no-framework template parameters & standard features.
Takai is the best starting point for everyone just joining the K2 Community.
Learn more about Takai and download the template package and the quickstart packages for both Joomla! 2.5 & 3.x at the Nuevvo website at: http://nuevvo.com/joomla-templates/free/takai