CustomBackgrounds-MC1.12-1.1.jar is a release file of the Minecraft mod Custom Backgrounds, made for Minecraft 1.12. It was published on June 11, 2017 and is 0 MB in size. For the full description, screenshots and every other version, visit the Custom Backgrounds mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.