Is there a decent repository for these kind of short animated backgrounds? Ideally pixel graphics like the one in the preview video. I'd like to experiment with

Is there a decent repository for these kind of short animated backgrounds? Ideally pixel graphics like the one in the preview video. I'd like to experiment with this, but a quick duckduckgo search didn't turn up much; some sites were advertising images as animated but they were in fact still images, and most of the others had gifs of varying quality, and weren't even consistently 1080p.