by prontotools on WordPress.org
Easily change the logo on a network site's WP login screen using WordPress's Customize settings.

Access your site's Theme Customizer settings.
Do some or all of the websites in your multisite network require a custom login logo? Well now you’re in luck!
This plugin allows you to customize the login logo per site, with the option to use the network’s default logo as well.
Once installed, access your theme’s Customize settings to update the logo.
Here is our Git repository. Feel free to contribute!