I really enjoy your Background Manager Mike!
A very good UI and design layout! The best and cleanest and easiest to understand plugin design I have seen! Could you perhaps create a tutorial on how you created your plugin? Since there is a lot to learn from your technique and clean UI design. (This was though not my original question but it just came up..:)
Adding multiple images at once into the manager?
Adding images into the Background Manager. If I want to change the order of how they come forth I tried to drag them around, but noticed that it did not work.
The plus (+) link that goes to the attached image post. What about being able to change the link to another page etc? I am using a few images and it would be nice to link this to a gallery page (which I will create using the standard WordPress gallery function) so people can really enjoy the backgrounds without any disturbance of page/post content covering most of it.