The Dynamics NAV 2015 Image library is an application that allows your to browse, search, copy, and save all Dynamics NAV images. Dynamics NAV images include all images from NAV 2009 through NAV 2015.
Where it can be used ? -- When Developing new Pages and looking for action images. -- During upgrade when (usually) confused for the action & role center images. Here's a few images of the new Image Library: