Unfortunately I could not use this plugin for two fundamental reasons:
1. The background image resizing mechanism is severely flawed. My images are 1920px in width but the plugin crunches it to a pixelated mess, in addition to displaying it in the wrong proportion. See side by side comparison of my frontpage with plugin I eventually found (left) and this plugin (right): http://i.imgur.com/IzcN7Z3.jpg
2. As far as I can tell there is no way to add different backgrounds to individual pages. You either have no backgrounds on all pages or the same backgrounds on all pages.
I appreciate the effort into creating this plugin but it needs a lot of work.