[Sean S]

yes you could do that, I all you have to do is create the image and set it as background, however, instead of setting it to repeat-x, or repeat-y, you should set it to something like

body {
background: url(image.gif) no-repeat top center #000;
}

one thing you got to make sure though, is that you have to make sure the edges of the big image that you create, fade into a solid color. That way, you can set a main background color and have the image merge in it.

I could probably help you out more if you show me the design that you have or trying to accomplish.