jondor

A shortcode which shows an gallery of downloadable images. The basic idea was to have an easy way to make some images available for download. 
For a working demo see: http://plugins.funsite.eu/downloadable-gallerie/
<h4>shortcode</h4>
<pre><code>[downloadable_images taxonomy="gallery" slug="wallpaper"]
</code></pre>
The default for taxonomy is gallery, the default slug is “wallpaper”. So the above could also be used as
<pre><code>[downloadable_images]
</code></pre>
I use this plugin together with “Enhanced Media Library” (https://wordpress.org/plugins/enhanced-media-library/) which enables a taxonomy on the 
media library (besides other features)
This plugin implements a custom thumbnail size of 300px width so probably you will have to regenerate thumbnails too. As a minimum for the 
photo’s shown if they are already uploaded. New uploaded photo’s will generate this thumbnail automatically.

downloadable gallery

A shortcode which shows an gallery of downloadeble images

Duc Bui

WP Default Feature Image brings the features that help you to specify the default feature image for your WordPress website. All Post Types and Taxonomies are supported.
Features included:
<ul>
<li>Specifying default feature images by any post types and taxonomies.</li>
<li>Specifying the time a default feature image will be updated whenever you add/edit your posts (publish, save draft,…).</li>
<li>Generating default feature images feature.</li>
</ul>

WP Default Feature Image

Help you to choose default feature images for any post types, categories, tags,...

downloadable gallery vs WP Default Feature Image