Guys, I’m kind of proud of this tool, so couldn’t resist to share the teaser.
In the beginning I was just missing Nitrogen on Sway. Since the Sway team’s just released swaybg, I thought to give it a frontend with some GTK-based UI. I liked the result, so I wanted to find some X11 backend, and I chose feh. The video below was recorded on i3-gaps, and it misses one feature: the background color picker (unsupported by feh). It should give you some first impression, however.
You may install Azote from AUR.