This plugin is very simple and straightforward. Just enter ?{list}? on each parent page or post where you want the children listed. Put it anywhere in your content and that is where it will show.
Then in your css..
.subpage-style { Put your styles here };
Easy as pie!

Andy's List Subpages Plugin

Nice and simple plugin that lists the children of a certain page or post in…

hildende

With installing this plugin you add functionality to <code>wp_nav_menu()</code> to show 
only children of the current page or start with a specific navigation level.

Child Navigation

Adds support for child navigation to wp_nav_menu()

Andy's List Subpages Plugin vs Child Navigation