Thanks!
I would advice to start with the basic icons (menus, animation, render, properties, etc).
When they are consistent in style, one can start with the phletora of special icons. They must probably look a bit different because of the complexity some of them have to portray. Maybe 3 colors/shades as standard. It is also good to get a little training on the icon style, before starting with the complicated ones.
But first of all color codes should be thoroughly planned.
The icons are based on Google’s material design which is Apache License Version 2.0. So free to use modify without attribution or anything.
They have 900 icons which we can use as a base. These are icons people already know, so this makes the UI experience even more streamlined.
I’ll comment more later when I get home from work. 