This is a free photo site that helps bloggers to find photos. There are multiple image sizes to choose from and adding them to your post is fast and easy. You can download the photo as well as the attribution link. It searches creative commons photos.
You can search for any topic using the search box (e.g. “Humpback Whales”, “Flowers”, etc.), preview the photo, and click “get photo” to download the photo as well as the proper attribution link.
PhotoPin uses the Flickr API and searches creative commons photos to use for your blog. They are not associated with Flickr in any way, other than powering the search results using their API.