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This one feels like it is cheating, but it is the MOST powerful way to get copyright-free material for the classroom. Knowing how to use search operators might radically change your work efficiency. For example, if you need to create a PowerPoint on the Civil War, you could start from scratch and find images and text and important information. By using the search term "filetype:ppt" and adding the search topic "Civil War" afterwards, Google will only return links to actual PowerPoints already created on the internet. This search term can be used with any file type. If you are looking for an existing test over the civil war in Word, search for "filetype:doc Test 'Civil War'". This can literally save hundreds of hours of time and effort.