This module no longer works on the latest versions of MIUI.
The version last tested on was EU 20.7.9. This repository is now archived.
This module systemlessly installs more modern icons to /system/media/theme/miui_mod_icons.
The icons will be shown in the app info screen, recent apps, and stock launcher.
Disclaimer
These icons were extracted from the MiRoom ROM project, which has unfortunately shut down.
Only the code is licensed under GPLv3. All image assets are property of the MiRoom developers.