Here is a fun and quick project that can add a bit of 3D to a flat photo by giving the corner a curl effect using Photoshop Elements. This is perfect if you want to give the illusion of a photo sitting on a surface like a desk, or peeling off of a wall. This is also a good general discussion on using Guidelines to help the layout of a project.
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And if you really want to learn how to use Photoshop Elements you should get my complete training. Its not just projects but instead a complete discussion of every tool, every menu, every option in the whole program. Check it out here https://www.howtogurus.com/photoshop_elements_tutorial.htm