OpenSSH's randomart was too visually indistinctive for me so I've patched it to draw TrueColor images of cats. I wanted to actually seed a GAN to generate consistent images, but that turned out to be too much of a bother so I'm just keeping a local cache on a machine. Works nicely for that use-case as I'm able to associate a particular image with a particular location when working at a particular box. Good enough.
https://github.com/ilammy/homebrew-ssh