Creative Commons image

http://www.public-domain-image.com/cache/fauna-animals-public-domain-images-pictures/cats-and-kittens-public-domain-images-pictures/domestic-cat-sitting-by-door_w725_h544.jpg

 I've learned that it's important to use fair-use images for projects.  If you don't, there is a chance (however slim it may be) that you could be sued or otherwise punished for using a copyright-protected image.  Fair-use images may be harder to find, but it'll be worth it when the image's owner doesn't come after you with a lawsuit.