To get this theme, pull it from github.com/discourse/material-design-stock-theme
Preview: Discourse Theme Creator
I would appreciate any input you have, but just remember the intention is for this to be a stock theme, while making it simple enough for any user to easily customize.
How to install a theme or theme component
If you click the Export button here
Your browser will download a full copy of the theme - including all the changes you made locally.
You can read more about this here