wp-calypso/apps/o2-blocks/src/category.js

import { getCategories, setCategories } from '@wordpress/blocks';

setCategories( [
	...getCategories().filter( ( { slug } ) => slug !== 'a8c' ),
	// Add Automattic block category to block picker
	{
		slug: 'a8c',
		title: 'Automattic',
		icon: (
			<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
				<path
					fill="#3399cc"
					d="M12 21.5c-6.1 0-10-4.4-10-9V12c0-4.6 4-9 10-9 6.1 0 10.1 4.3 10.1 9v.6c0 4.5-3.9 8.9-10.1 8.9zm6.9-9.5c0-3.3-2.4-6.3-6.8-6.3s-6.8 3-6.8 6.3v.4c0 3.3 2.4 6.4 6.8 6.4s6.8-3 6.8-6.4V12z"
				/>
				<path
					fill="#000000"
					d="M14.1 8.5c.6.4.7 1.2.4 1.7l-2.9 4.6c-.4.6-1.2.8-1.7.4-.7-.4-.9-1.2-.5-1.8l2.9-4.6c.4-.5 1.2-.7 1.8-.3z"
				/>
			</svg>
		),
	},
] );