Lucy Tomas

Very simple plugin that will search for all the first images of your published posts, pages or custom post types and set them as the featured image.
<ul>
<li>You can choose the post type you want to run the plugin on.</li>
<li>Option to overwrite the already selected futured images.</li>
<li>Option to select From / To date.</li>
</ul>

Set All First Images As Featured

still works

It simply didn't recognize any images in any of the posts, and so didn't work. :(

Didn't see the images in the posts

IT works on 5.0.3

Sets the first image of your posts, pages or custom post types as the featured image.

Ibon Azkoitia

This plugins gives you the option to add a featured image before or after your header with a simple selection and save of it.
Note: although this plugin requires the <a href="http://studiopress.com/" rel="nofollow ugc">Genesis Framework by StudioPress</a> or child themes, it is not an official plugin for this framework and is neither endorsed nor supported by StudioPress.
Files structures and concept are based in <a href="http://robincornett.com/plugins/display-featured-image-genesis/" rel="nofollow ugc">Display Featured Image for Genesis – by Robin Cornett</a>
<h4>Future Options</h4>
<ul>
<li>different styles options</li>
<li>and more!</li>
</ul>

Genesis Featured Image

Great Plugin!

This plugin works within the Genesis Framework, and lets you display a featured image.

Set All First Images As Featured vs Genesis Featured Image