I am always on the hunt for great images that are released for Creative Commons licensing for use. Check out Pixabay.com. It has a very large database of images, it is easily searchable by keyword. Another cool feature is that it is also categorized for easy browsing. It makes looking for those beautiful images for presentations and products much easier. Added to this, the advanced search will allow you locate vectored images, illustrations, videos and layout types. Pixabay.com is great!