This is basically the superb action (toolbar etc) icons from the Faenza icon theme added to the Ubuntu Mono Dark theme. (Cudos to the original creators.)

Note: This package does NOT contain the Ubuntu Mono Dark / Humanity icons, so you'll either need an Ubuntu default install, or the contents of the humanity-icon-theme and ubuntu-mono packages from the Ubuntu repos.

If you see any inconsistencies or Faenza icons appearing where they shouldn't be post a comment down below.