A bit like Sierra :)
Dark Theme
If you prefer a lighter theme -
https://github.com/ar0ra1/plank-theme-jenny.git
# git clone https://github.com/ar0ra1/plank-theme-joey.git /usr/share/plank/themes/joey/
$ plank --preferences
choose theme = joey
Works best with intellihide behaviour!
Feedback and improvements are always appreciated ;)