Well, not exactly. Following the rules of attribution may allow us to use other's work but never to claim as our own. All of us are creators and right now you may not see the purpose in copyright but one day you will. Think about how you would feel if you see your artwork, poem, music lyrics online and no one asked your permission to use - or worse yet ,you are not given credit!
Use these resources to find images with built-in permission to reuse in your work:
Google Images (with license filter) - after searching, click Tools > Usage Rights > “Labeled for noncommercial reuse”
You will still need to provide a citation or attribution for images, unless your source specifically states that no attribution is required. This is true even if you have permission (granted or built-in) to use them.