So perhaps someone can help me with my confusion about these tweaks. Is it possible (and if not it should be,) to create a page that has a tiled image running along the top of the page background, 100% browser width, a separate color in the center of the page, again 100%, and then another tiled image along the bottom of the page 100%, without having to create a single page background image (that limits my vertical page height to the height of the image.)

Probably makes no sense how I'm trying to explain it. I want a tiled image that runs 100% of the top and bottom of the page background, and I want the middle area to expand, automatically pushing the bottom tiled image as I add content.

Sorry that I cannot explain it better than that.