Infinite 2D Background Possible?

Guys/Girls, I have this project (see below) just like in Marks Deep Dive lesson where he uses key frames to animate camera, he has an infinite background with the color pink. I know he selects in the Pref to have the background pink, but what if you wanted to make the background have a little more than just color? I nested all the background stuff into "BACKGROUND MAIN GROUP" Next I want to do exactly what Mark did in that lesson where I have about 10 images I want the camera to fly around in 3D space to look at, just as he did with the dancers but with pics.
How do you go about creating a background large enough so no black edges are showing? I've tried scaling everything but is there an easier or correct way of doing this so that no matter where the camera is pointing you see the "starburst, two color ray, and the light wall, etc?"
or can I at least create a gradient infinite gradient background then have the camera fly around in 3D space?
Do I create the flying camera than create a 3D box circumventing the camera.
I'm apologize if this is too much to ask or is confusing.
[IMG]http://i43.tinypic.com/15odrnq.png[/IMG]

I did set the image to 2D and for some reason it woundn't stick. Even some of the images wouldn't allow me to set them to "pass through" (i think that was the setting, not by my computer today, I'm on vacation in Palm Springs) Luckily, I didn't save so I rebooted Motion and all of the photos now were able to set to "pass through" and the 2D image was now infinite.
It seems to me that as the project got more and more complex Motion started bugging. The restart solved everything.
Thanks peeps.

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