This is my fav wallpaper for desktop and I can’t live without it, I think it’s just perfect for focusing elements, but also artistic, it seems something like abstract art but in a painted style; probably not AI generated but I don’t know the artist’s name. I would really like to know more about this style and to find similar stuff.
https://www.vecteezy.com/photo/10305070-watercolor-background-digital-drawing-sweet-pastel-gradient-background-colorful-paint-like-graphic-color-glossy-beautiful-painted-surface-design-abstract-backdrop
This is the closest thing I could find that wasn’t the wallpaper you posted by just searching variations of “watercolour gradient wallpaper”
There’s probably something you’d like in the results if you dig deep enough tbh, but only you’d know exactly what you’re looking for