[cjnicholls]

Lively[1] does this with desktop wallpapers if that helps and is FOSS. Additional shaders can be found on shadertoy[2] and others.

It can be a good way of turning your computer into a heater ;)

[1] https://rocksdanister.github.io/lively/

[2] https://www.shadertoy.com/

[noduerme]

That's really nice. Mac OS needs to get some shadertoy desktops asap. I can't even get a toaster to fly anymore :(

[delosw]

Toasters and more... https://www.bryanbraun.com/after-dark-css/ (Well, it mimics the old screensavers, anyway.)