This plugin is a WordPress core feature-plugin that adds cropping to background images for parity with header images. For this particular feature the …
Custom Background Changer Plugin is allows you to very easily to add custom color or background image on each post and pages.
Customize your widgets without any CSS knowledge! - Mihajlovicnenad.com
Use a library of beatiful patterns and decorate your webpage background.
This plugin provides the option to select a default custom background.