This plugin will allow you to very easily customize the login screen via the WordPress Customizer to match your brand, site or mood.
You will be able to setup a custom logo, background image, and color/opacity overlay.
This plugin is made for people looking for a very light and simple solution as an alternative to big plugins with tons of options and scripts. In this idea if you still have a good idea or suggestion for the plugin, refer to the github page.
Credits
Photo by etiennelhd from Unsplash.
Icon “Wood” by Manohara from the NounProject.