When creating new pages, the user is faced with an empty canvas that can be very hard to work with. We should explore showing a modal as you soon as you add a new page showing the different available block patterns similar to the modal we have when you click "explore" in the block patterns inserter.

Ideally, we'd have ways to mark "patterns" as "full page patterns".

Also, the question here is what to do with "custom page templates" provided by themes. I think it would be cool to allow the user to pick from these templates as well.

One interesting related question as well is whether these patterns should fill the "post content" of the page, or a new "template" for the current page, or potentially both somehow and how to make that distinction when registering the patterns.