As pointed out by sdeshmuk, we need to define the icons for our Gutenberg blocks. 

These icons are used in the new editor and they appear in a few places, when you add a new block, or when you click on the list of blocks in a given page.

Wordpress provides an embedded set of icons by default, the Dashicons set:

https://developer.wordpress.org/resource/dashicons/#search

So we can use any of those, but we can also create our own custom icons on SVG format, so it may be a fun mini-project for design which could give P4 Blocks a bit of personality.

Tasks

• Just review existing icons in https://k8s.p4.greenpeace.org/gutenberg/wp-admin/post-new.php?post_type=page
• Check if they make sense, otherwise replace for other existing icons