WP-Inject is a WordPress plugin designed to make it easier to find Creative Commons licensed images into blog posts.
… the plugin adds an easy to use search metabox to your WordPress editor (“Add New” post screens). Simply enter any keyword to find great photos for your post.
Advanced users can head to the WP Inject settings page and fine tune the plugin. A lot of different options let you control most aspects of how WP Inject finds and inserts images into your posts. By editing the templates you can control exactly how the photos and automatic attribution will look on your blog!