From @OpnSrcConstruction on August 13, 2017 13:6

in a recent post on G+ Termux community, a community member asked if it was possible to change the Android background from Termux; and I though the Termux-api package might be a great way to implement that feature. This could lend itself to really cool Termux scripts to change the Android backgrounds. I was just looking at a package for Linux recently, that changes the wallpaper based on the weather; and if this feature were to be implemented it could make things like that and so much more possible from Termux.

Copied from original issue: termux/termux-packages#1263