On a smaller scale, I sometimes like making (and looking for) tweetcarts. Search for the #tweetcart hashtag on Twitter; those are procedural animations made with PICO-8 in less than 280 chars. There is a code golf aspect to it, but it's a bunch of math first. If you're interested, some basics are explained here: https://demobasics.pixienop.net/tweetcarts/