shazdeh

This plugin integrates with WP 3.0 built-in Custom Backgrounds, and enables you to choose from a growing collection of patterns provided by <a href="http://subtlepatterns.com" rel="nofollow ugc">Subtle Patterns</a>.
To updaters: Please note, you might need to reselect your chosen pattern.

Background Patterns

Use a library of beatiful patterns and decorate your webpage background.

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.

Background Patterns vs Genesis Custom Backgrounds