After reading the article below, I think I will start using Yahoo image search to find the photos I'm looking for on Flickr. It sounds like it will make the whole process just a bit easier.
The main idea is to find images that are free and legal to use, with no copyright infringements. Just because an image is out there on the Internet does not mean that you are free to do with it what you would like, and with so many available under the Creative Commons license, there is no need to. I personally make my photos on Flickr available under CC licensing, and I thank all of you photographers and artists who do the same.