HD-Background Selector is a simple module that allows you to apply a different background style to individual pages on your Joomla website. You can select background colours, images or repeated patterns. It can be applied to the main background or to specific elements on your site (eg. module positions, columns, headers, footers, main content box, etc).
You can also use this to apply random backgrounds, multiple overlaid backgrounds or day-specific backgrounds
Joomla's templates generally have the same background style for each and every page. By applying this module to a specific page the background can be styled individually from the others, increasing the variety of your design without resorting to using multiple templates.