I can't wait until people rediscover Sixels and get actual graphics in the terminal in a network-transparent fashion. Modern terminal emulators support it, it just isn't widely known.
Really, is Sixels support that common now? Do you have a supported Linux terminal that you recommend for it?
xterm supports Sixels, and I'd be surprised if it were the only one.
And this library enables things like video and X11 using Sixel, plus it has a list of terminals which support Sixels in the README: https://github.com/saitoha/libsixel