These tiling background patterns are FREE. CC-0. Use ’em for whatever–website backgrounds, fabric patterns in a digital painting, SketchUp etc. (But if you want to show me a project you’ve used ’em in, let me know!). Right-click; save-as should work.
I love making symmetrical doodle patterns at church. Why I never thought to do them in color in Krita before (using the Mirror function) is beyond me!
Links, attribution appreciated but not required.