>>7769029This one's a classic, but every time I see it posted, it has a bunch of jpg artifacts.
Some months ago, I made this lossless gif version of it (at least it *should* be; I think it's exactly 256 colors), taken from
http://www.effectgames.com/demos/canvascycle/There's a bunch more pixel-arty stuff there if you're interested, and a still screencap of any frame of any of these make for a good wallpaper.
For gifs, though, it's a little tougher. I can't exactly remember how I got this gif. I either used ShareX, cropped & resized it in Aseprite, then optimized it with ImageMagick, or I used some HTML5 canvas to individual frames thing from some old stackoverflow question. One of those two.