Origami Paper is a free theme for WordPress created by SiteOrigin.
Origami Paper is an Origami child theme. It takes Origami, which is a clean simple theme, and transforms it into a richly detailed theme with a warm wooden background and a host of small details to give your site a high quality feel. Just like Origami, this theme integrates nicely with our Page Builder. This means you can use Origami Paper for antyhing from a simple landing page to a fully functional business theme.
(Description "Origami Paper" Theme from wordpress.org)
You can download Origami Paper for free via the provided download link and include it into your themes folder of your WordPress installation. Also you can directly search for it in the WordPress admin interface in the themes section and install and activate it from there.
More information, screenshots and reviews of Origami Paper Theme can be found here.