[setishock]

The layout is just for the widgets. Where they get parked on the page.
Pop this in your additional.css and adjust as needed.

/* Seti added: Background color and image */
.vbcms_content {
	margin:0.5em 0 1em;
	width: 100%;
	float: {vb:stylevar left};
background: #000033;
background-image: url(path/to/your/image);
background-repeat:no-repeat;
background-position:center top;
}

This may not work as it sits but it'll give you a starting point.