Outdoor shower/water day for kids.Could easily be made with hollow box uprights, run the water tube through one and the top hollow box with a PVC tube that you drill holes in for the water to run out. Faux paint it to look like copper, really pretty easy.
Cover an old tire in rope and create a small ottoman-for outdoor usage only, tires are toxic! This is the most fun DIY rope project but, as stated, don’t get carried away and place the ottoman inside. The rubber can be toxic to your environment.