Use the sliders to create a custom Windows 11 background. (F) is foreground, (B) is background. When you are done, go into fullscreen, right click the background, and click "Save as..." to download your image. You can go to edit.photo to crop your image, and go to upscale.media to increase the quality.
All imagery is from Microsoft Windows 11 Inspiration is from another site that I can't say here. (Just search "custom windows 11 background" and go to Images) Spotlight and vignette is from here: scratch.mit.edu/projects/444395181/