mores

MetaBackGround will let you specify a post background by adding a custom field. This is not the sorcerer’s stone, but some users are not comfortable with php and editing of theme files, so all they need to do is install this plugin.

MetaBackGround

I once created this plugin for someone ... they needed to set backgrounds on a per-post basis.

storo

This Plugin allows you to add pictures to use in your theme, so it easy to organize
Compatible with all WordPress versions (since 2.3 to 3.2). Don’t forget to check the config panel.
In Spanish:
Este Plugin te permite agregar imagenes para ser usadas en tu tema, de forma que sea facil organizarlas .
Compatible con todas las versiones de WordPress (2.3 hasta la actual 3.2). No olvides revisar el panel de configuracion.

multimedial images

multimedia images is a plugin for Wordpress that allows you to upload images to use…

MetaBackGround vs multimedial images