The preceding was achieved with a combination of:
Install StumpWM, Emacs, Compton (most installs of this will include transset or transset-df) and URxvt.
After you've done the first step, find a nice looping video you like (https://www.youtube.com/watch?v=5N2ySHlCjms is what I'm using) and run it in window 0 of StumpWM (if you can't find a means to persist a nice looping video or gif to disk, you may want to try out livewallpaper or electricsheep in your window 0 slot).
If using a movie or gif, run it in loop with mpv:
mpv -loop --no-keepaspect --geometry=1920x1024 Rain\ and\ Thunder\ with\ animation.-5N2ySHlCjms.webm
Also, ensure you have a background image set that more or less works with the theme you go with (I used a rain background).
Now, you'll need to update your StumpWM (luckily, you can evaluate new code on the fly in your ~/.stumpwmrc through a slime server + slime-connect in Emacs.
Define the following (or something close to it) and evaluate it in your slime REPL:
(define-key *root-map* (kbd "e") "working-emacs-ss") (define-key *root-map* (kbd "s-e") "working-emacs") (defcommand working-emacs-ss () () "Run or raise emacs." (run-or-raise "aterm -title myemacs -e sh -c 'emacs -nw'" '(:title "myemacs")) (pull-window (nth 0 (sort-windows (current-group)))) (pull-hidden-other) ) (defcommand working-emacs () () "Run or raise emacs as the only window." (pull-window (nth 0 (sort-windows (current-group)))) (only) (run-or-raise "aterm -title myemacs -e sh -c 'emacs -nw'" '(:title "myemacs")))
In my case, I chose to compile a version of URxvt from source, and used the aterm name, as it's the easiest way to have a custom URxvt + the OS one installed without conflicts - in your case, use whatever editor you like.
This custom StumpWM command will ensure that anytime you switch to Emacs (via your StumpWM escape key combo + define-key binding, it will pull in the window 0 behind your active Emacs window).
Now, you'll need to redefine a few built in StumpWM functions so you can avoid having window 0 pop up as you navigate your windows in the normal manner.
(defun other-hidden-window (group) "Return the last window that was accessed and that is hidden." (let ((wins (remove-if (lambda (w) (or (eq (frame-window (window-frame w)) w) (eq (nth 0 (sort-windows group)) w))) (group-windows group)))) (first wins)))
At this point, all that's left to do is run Compton:
compton --no-fading-openclose --sw-opti
(with your preferred options)
and then set the alpha transparency on your aterm/Emacs session:
transset-df -a 0.9 # then click on Emacs
Congrats, you can now have a peaceful coding/browsing/(whatever in the world you feel like doing in Emacs) session with a super slick animated background.
Oh, and if you're interested in how I recorded the video, you can do the same with ffmpeg (no fancy screen capture software needed) by doing:
ffmpeg -f x11grab -s 1920x1024 -i :0.0+0,40 -c:v libx264 -preset ultrafast -crf 0 /tmp/emacs.mkv ffmpeg -i /tmp/emacs.mkv /tmp/emacs.mp4 #or whatever output you want - mp4 is about 1/100th the size