Strawberry Jellyfish

Easily create full screen image backgrounds and fading slideshows that stretch 
and adapt to the size of your page.
You can either use it as a global “cover” style background that will be 
displayed on all pages and posts of your WordPress website or you can give 
individual posts or pages including custom post types their own specific 
background – great for giving parts of a website a whole different look.
Jellyfish Backdrop makes fullscreen background slideshows easy by allowing 
you to assign multiple backgrounds to any page or post.
<ul>
<li>Unlimited number of post and slideshows.</li>
<li>Create different slideshows or backgrounds or different areas of your site.</li>
<li>Easy to use admin panels with sortable images and media library integration.</li>
<li>Display images in any page element allowing slideshows anywhere, not just as 
a background!</li>
</ul>
<h4>Demo</h4>
See the plugin homepage for demos and full details: 
http://strawberryjellyfish.com/wordpress-plugins/jellyfish-backdrop/
<h3>Usage</h3>
Visit the settings page to set up the global and default options. Here you’ll 
be able to set up a default background image that will be displayed on every 
page of your blog, enable or disable the global background or individual post 
and page background support as well as set up the default options.
To add a unique background image or slideshow to a specific post or page, 
first make sure that in the Enable Page and Post Type Slideshows section 
on the setting page, you check any post types you want to allow slideshows 
to appear on. You’ll now find a new area on the post / page edit screens 
where you can add images to the Backdrop Slideshow and alter fade time, 
slide display time and where the images will appear. Jellyfish Backdrop uses 
the WordPress image uploader and Media Library, so it’s easy to choose the 
images you want to use. You can also reorder the images by dragging. 
Once you’ve finished adding and arranging your images, be sure to save the 
post or your changes will not be saved.
Page / Post backgrounds will override the default background so it’s possible 
to define one background to be used site wide and another on a specific page.
By default images are shown as the main page background (body), however you 
can make the images appear as backgrounds to other areas of the page by 
supplying any valid element id or class name in the Container field on the 
admin page. eg. #main, .header

Jellyfish backdrop

Fullscreen background images and background slideshows on any WordPress post or page. Easily upload and select images using the media library.

itthinx

This plugin provides an automated way to convert any standard WordPress gallery that is embedded on a page using the [gallery] shortcode into a WunderSlider.
WunderSlider Gallery also supports <a href="https://wordpress.org/extend/plugins/nextgen-gallery/" rel="ugc">NextGEN Gallery</a> to embed any gallery as a WunderSlider using the [wunderslider_nggallery] shortcode or by enabling it as the default renderer for the [nggallery] shortcode.
The plugin requires the WunderSlider which is available freely for personal use and can be downloaded on the <a href="http://www.itthinx.com/wunderslider/" rel="nofollow ugc">WunderSlider</a> page.
A license is required to be purchased for commercial use, see the WunderSlider page for more details.
Feedback is welcome. 
If you want to leave feedback or want to provide constructive criticism, please do so at the support pages indicated below.
Please try to solve problems there before you rate this plugin or say it doesn’t work.
Limited* free support is provided on the <a href="http://www.itthinx.com/wunderslider/" rel="nofollow ugc">WunderSlider</a> page only. Please be specific when stating any issues you might experience. * Limited means: thank you for your feedback and please be patient as you should get an answer as soon as possible.
<a href="http://twitter.com/wunderslider" rel="nofollow ugc">Follow WunderSlider on Twitter</a> for updates on the WunderSlider and its plugins.
<a href="http://twitter.com/itthinx" rel="nofollow ugc">Follow itthinx on Twitter</a> for updates on this and other plugins.
Usage / Notes on settings
After you have followed the instructions on installing WunderSlider and the WunderSlider Gallery plugin, go to Appearance > WunderSlider Gallery and have a look at the default settings.
<pre><code> [gallery] shortcode attributes :
</code></pre>
<ul>
<li>
The <code>size</code> attribute uses <code>full</code> by default. Set it to another size if you don’t need the full image size.
Default sizes are <code>thumbnail</code>, <code>medium</code>, <code>large</code> and <code>full</code>.
</li>
<li>
WunderSlider attributes that use a dash in the attribute name must be used with an underscore instead when passed to the <code>[gallery]</code> shortcode. If used, <code>container-class</code>, <code>container-style</code>, <code>container-height</code> and <code>container-width</code> must be passed as <code>container_class</code>, <code>container_style</code>, <code>container_height</code> and <code>container_width</code> to the <code>[gallery]</code> shortcode. 
This is especially important when the <code>display="proportional"</code> setting is used, as you will have to provide the container width and height explicitly.
Example:
[gallery display=”proportional” container_width=”80%” container_height=”360px”]
</li>
<li>
If you do not want the WunderSlider applied to a specific gallery, you must add the <code>wunderslider="false"</code> attribute, for example:
[gallery wunderslider=”false”]
</li>
</ul>
Usage with <a href="https://wordpress.org/extend/plugins/nextgen-gallery/" rel="ugc">NextGEN Gallery</a>
Any NextGEN gallery can be rendered as a WunderSlider using the <code>[wunderslider_nggallery]</code> shortcode or by enabling defaults for NextGEN Gallery shortcodes in the Appearance > WunderSlider Gallery settings.
Example:
<pre><code> [wunderslider_nggallery id="123"] will render a WunderSlider for the NextGEN gallery with id 123.
</code></pre>
The [nggallery] shortcode can be rendered as a WunderSlider by either enabling it by default or by specifying:
<pre><code>[nggallery id="123" wunderslider="true"]
</code></pre>
For this to take effect, the option to handle NextGEN Gallery shortcodes must be enabled on the settings page Appearance > WunderSlider Gallery.
As with the <code>[gallery]</code> shortcode, any WunderSlider attributes can be passed to <code>[wunderslider_nggallery]</code> or <code>[nggallery]</code> – those that use a dash in the attribute name must be used with an underscore instead: <code>container-class</code>, <code>container-style</code>, <code>container-height</code> and <code>container-width</code> must be passed as <code>container_class</code>, <code>container_style</code>, <code>container_height</code> and <code>container_width</code>.
Examples:
<ul>
<li><code>[wunderslider_nggallery id="1" container_width="80%" container_height="300px" display="proportional"]</code></li>
<li><code>[nggallery id="1" wunderslider="true" container_width="80%" container_height="300px" display="proportional"]</code></li>
</ul>

WunderSlider Gallery

WunderSlider Gallery turns default WordPress and NextGEN galleries into responsive fullscreen and embedded WunderSlider slideshows.

Jellyfish backdrop vs WunderSlider Gallery