Gold Leaf (Free Version) is a simple minimalist, flat & gold texture icon pack with transparency in the icons to blend in well with your backgrounds. Gold icons feature clean & flat handmade designs. Color adjusted wallpapers included.
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.
You may need a 3rd party launcher to apply the icon pack. If your stock launcher doesn't support icon packs, you can use apps like Awesome Icons or Unicon to change your icons without using a 3rd party launcher.
This is the free version of the app. Get the pro version here: