Use an old tire to create a small backyard pond. My kids, 3 sons, have been helping with yard work and planting. They keep asking for a pond. I think this is a great DIY project to do outside with them. Looks simple.
Tower of lights. Add solar lanterns and you have a summertime eye catcher in your garden. Replace with bird feeders during winter time and you'll create a bird magnet. (Or alternate bird feeder and lantern?