With SharePoint 2013, a user only needs to be a site collection administrator to apply a packaged design rather than be a farm administrator. This offloads the burden of applying site collection level designs from farm administrators and makes it simpler for site collection administrators to obtain packaged designs from third parties and apply them.
Follow these steps to import and apply a design package:
Navigate to the site in your preferred web browser.
Select Site settings from the Settings menu.
Select Import Design Package from the Look and Feel section.
Select the design package to import.
Select Import.
Importing a design package adds the SharePoint solution file (WSP) to the Solutions Gallery of the site collection and applies the customizations it contains. These SharePoint solutions are sandboxed solutions that allow the site collection administrators to upload and deploy them rather than requiring a farm administrator...