[csdvrx]

Give any sixel-less terminal the sixel-tmux googles and you'll see an ascii rendition of the sixel images: https://github.com/csdvrx/sixel-tmux

It's not ideal unless you use a very small font, but it's better than nothing.

BTW some people recompile libvte to get proper sixel support in their favorite terminal: https://github.com/mate-desktop/mate-terminal/issues/410 and then get results like: https://www.youtube.com/watch?v=mLQbAYJGZMA