UnderWordPressure

Cosimo is the acronym for “Change Of Scene Image Many Often”. Static background images are boring very quickly. Cosimo wants to avoid this. 
Users of <a href="https://wordpress.org/extend/plugins/nextgen-gallery/" rel="ugc">NextGEN gallery</a> can prepare a gallery of wallpapers and use them on Cosimo settings. 
A string in the glob-style format, for example, *69*Summer, Spring?-Break*, etc. can also select images from the media library. 
The change interval may following a number of page views or time (minutes, hours, days, weeks, months, years done). 
The background image is used on the site about inline CSS, as in this example:
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body {background-image:url(http://…../wp-content/uploads/bg-superduper.jpg) !important;} 
 Cache tools such as <a href="https://wordpress.org/extend/plugins/wp-super-cache/" rel="ugc">WP Super Cache</a> can cause additional delays, especially in the range of hours. If necessary, the plugin could be expanded to also change the Header image. User feedback is welcome.
</blockquote>

Cosimo – Change Of Scene Image Many Often

Change the background image of the BODY-Tag. A pool of images from Media Library and / or a NextGEN gallery can be used.

Travis Smith

By default, <a href="http://wpsmith.net/get-genesis" title="Genesis" rel="nofollow ugc">Genesis</a> doesn’t turn on WordPress Custom Backgrounds. Genesis Custom Backgrounds enables custom backgrounds and creates an option to enable selection of a default background from the sets of backgrounds provided by <a href="http://wpsmith.net/go/studiopress" title="StudioPress" rel="nofollow ugc">StudioPress</a>. Currently, it is broken down to Dark and Light backgrounds with subfolders. You can easily provide the user more options by simply uploading more backgrounds with in either the light or dark folders. Upload using the following structure, folder: camo & files: camo-1.png, camo-2.png, and camo-3.png (in all lowercase). Furthermore, you can also upload a custom background via the WordPress Custom Background via Appearance > Background. You can easily add customization ability for the site to easily switch default backgrounds or upload their own (which will always overwrite the default).
IMPORTANT: 
You must have <a href="http://wpsmith.net/get-genesis" title="Learn more about Genesis" rel="nofollow ugc">Genesis</a> installed. Click <a href="http://wpsmith.net/get-genesis" title="Learn more about Genesis" rel="nofollow ugc">here</a> to learn more about <a href="http://wpsmith.net/get-genesis" title="Learn more about Genesis" rel="nofollow ugc">Genesis</a>
<h3>Special Thanks</h3>
I owe a huge debt of gratitude to all the folks at <a href="http://wpsmith.net/get-genesis/" title="StudioPress" rel="nofollow ugc">StudioPress</a>, their <a href="http://wpsmith.net/get-genesis/" title="StudioPress Themes" rel="nofollow ugc">themes</a> make life easier.

Genesis Custom Backgrounds

This plugin provides the option to select a default custom background.

Cosimo – Change Of Scene Image Many Often vs Genesis Custom Backgrounds