This definitely falls into the This is cool!
category. The Gutenberg Blocks Design Library is an awesome plugin that used standard blocks to create a range of useful layouts.

What’s great about this plugin is that it uses blocks that are part of the new WordPress Editor already, and combines them to create a collection of mini-layouts for a variety of use cases. I especially love that this doesn’t require you to add a new level of complexity to the new editor.
Instead, it uses the blocks that are already available, but in prepackaged combinations that address practical needs.
There’s a free version of the plugin with about 50 free combinations. You can read more about this over at WPTavern:
What do you think?