If you use flat material design themes then you are on the right page. Matcha theme is one of the best themes which has material design and looks great along with its own icon pack. It is based on Arc theme and support Gtk3, Gtk2, Gnome Shell and support almost every desktop environment such as Gnome, Cinnamon, Mate, Xfce, Mate, etc.
We are offering Matcha themes and icon pack via our PPA for Ubuntu/Linux Mint. If you are using distribution other than Ubuntu/Linux Mint then download zip file directly from theme page and install it in this location "~/.themes" or "/usr/share/themes". There is also theme for Gnome Shell which can go along with its Gtk version. If you find any kind of bug or issue within this theme then report it to creator and hopefully he will fix it soon.

Matcha Matcha theme
Matcha Matcha theme
Matcha Matcha theme

Available for Ubuntu 18.04 Bionic/18.10/and other Ubuntu based distributions
To install Matcha GTK theme in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:


Available for Ubuntu 18.04 Bionic/18.10/16.04 Xenial/14.04 Trusty/and other Ubuntu based distributions
To install Matcha Icons in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

That's it
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