Teaching students basic copyright rules & etiquette is a life skill that should not be overlooked. Part of this includes teaching students about using images from the internet.
Just because an image appears in a Google search DOES NOT mean that students have permission to use it. In fact, most of the images that appear in a basic Google image search are not licensed for free use. But, there is an easy trick for you and students to filter these images to only view images that are licensed for reuse or modification.
First, search for an image. For example, search for "puppy". Then, click the Images tab and then the Tools button.
Once you click the Tools button a new menu will load. Select the Usage rights down drop. Click Labeled for reuse with modification. "Labeled for reuse" grants permission to use the image commercially while the "Reuse with modification" option gives you the ability to alter the image.
Once you select the usage rights, a new set of images will load that are copyright safe for student and teacher use!