I've been building Wordpress sites for years and the process of finding images always slows me down. You either have to pay per image for good ones, or waste time doing a Google image search, save it, resize it, and upload it to Wordpress.
Grab a copy of the WP Quick Pic Studio plugin and access 80,000 free images without ever leaving the 'New Post' page in Wordpress. Even if you're posting from your cell phone! http://goo.gl/MZLZE6