Once a week I do this - I create a background image that can be used in powerpoint (or similar presentation programs) and I share it here with you. Of course, you are not bound to use these free images in powerpoint - you can use them in any of your projects at home, work, school, or at church. Use them as wallpaper for your laptop or smartphone. Print them out and use them as wallpaper for your kitchen. whatever. I only ask that you share them freely and that you tell others that you found then here.
This particular photo was take a couple of weeks ago at the Salvation Army's summer camp south of Omaha, Nebraska.