Also be aware of copyright. It's not great to just randomly download images off the web. Reverse image search points here: https://wallup.net/simple-background-20/
For an image like this you could use vector shapes and Pattern preview in Photoshop. Or same way in Krita. or any vector editor supporting symbols/clones. Affinity Designer for example. Any automatic solution like Unity Art engine most likely would break vector shapes appearance across the seams