Personally I have been using this one https://getwallpapers.com/wallpaper/full/e/3/d/1515937-dark-windows-10-wallpaper-2560x1920-windows-10.jpg
Personally I have been using this one https://getwallpapers.com/wallpaper/full/e/3/d/1515937-dark-windows-10-wallpaper-2560x1920-windows-10.jpg
This one:
Also i have bunch more from the artist as my lock screen wallpapers, randomly selected