Curse You, Copyright!

People will sometimes put images in their blog posts to make it a little more interesting, or to try and make it catch your eye so you'll read it. A great place to get pictures from (without infringing copyright, that it) would be Flickr Creative Commons; a website a lot like Google images, but a lot of them allow you to use them without breaking any laws, so it's altogether better than Google images if you're willing to go the extra mile to avoid getting sued. You still need to add attribution, though; the best place to do that would be through a caption above or below the picture you're using.