(This is a expanded archiving of something I posted over on Mastodon. You can find it here.)

TL;DR: I love blurred and grain/noise textured wallpapers, and think should be way more extended in the UX scene, because:

1. gradients/colour blends are extremely soothing and can represent a bunch of moods;
2. they are recreational enough but not overly distracting;
3. they are easier to balance/fine-tune/customise/re-flavor colour-wise than high-detail images;
4. a bit of noise filter adds texture/grain that feels very satisfying (borderline ASMR/synaesthesia);
5. they are way more scaling-resilient and therefore resolution-agnostic. Higher resolution/DPI, or a larger screen? No matter; they will further blur themselves into place (:

And I think they do have a niche to fill in UI/UX: modularity, ability to be procedurally generated, ability to change with accent colours/mood/hour of the day, and overall an extra, system-wise aspect of customisation for the user.