barteled

Slideshow background adds a full size, smooth transition slideshow to the background of a WordPress site. Images can be selected from the media library or uploaded via drag-and-drop. Every page load will begin at a random position in the image loop so that users are not presented with the same start image every page change.
Additionally, the images maintain their aspects ratios during resize and turn off for mobile users.
This plug-in was conjured up by a nerd at <a href="http://think-bowl.com/" title="It's less of a tank and more of a bowl." rel="nofollow ugc">Think Bowl</a>

Simple Slideshow Background

Display a full size slideshow in the background featuring images from the media library.

Sarven

Easy Fullscreen Slider allows you to add background fullscreen slider or single fullscreen image. You can set default settings for all posts/pages or set individually settings for each page/post. 
After activation you must change the disable option and add images.
This plugin uses jQuery library <a href="http://buildinternet.com/project/supersized/" title="Supersized webpage" rel="nofollow ugc">Supersized</a>.
<h4>Options</h4>
Transition effect:
<pre><code>'none' - No transition effect
'fade' - Fade effect
'slideTop' - Slide in from top
'slideRight' - Slide in from right
'slideBottom' - Slide in from bottom
'slideLeft' - Slide in from left
'carouselRight' - Carousel from right to left
'carouselLeft' - Carousel from left to right
</code></pre>
Transition speed:
<pre><code>Speed of transitions in milliseconds
</code></pre>
Slide interval:
<pre><code>Time between slide changes in milliseconds
</code></pre>
Controlls:
<pre><code>Show arrows navigation
</code></pre>
Autoplay:
<pre><code>Determines whether slideshow begins playing when page is loaded
</code></pre>
Disable:
<pre><code>Off slider
</code></pre>
Progress bar:
<pre><code>Show progress bar
</code></pre>
Thumbnail navigation:
<pre><code>Show thmubnails
</code></pre>
Background pattern:
<pre><code>Add background pattern
</code></pre>

Easy Fullscreen Slider

An easy-to-use WordPress fullscreen slider plugin for Supersized.

Simple Slideshow Background vs Easy Fullscreen Slider