Dark Void (Free Version) is a minimalist black themed Icon Pack featuring light wallpapers/backgrounds with scenic, space, scifi and urban themes. Dark Void features simple, clean, minimal, flat black icons for android devices. Icon centers are transparent showing the background behind them. The hollow icon center changes with whatever is behind it making the entire display blend together really well.
You can manually edit icons in most launchers by long-pressing the icon you'd like to edit.
Widgets: If your widget stops updating, check your system or battery settings to make sure the app is exempt from battery optimization.
This is the free version of the app. Get the pro version here: