This is a sample page with a marble background. I put it on my page using:
<body style="background-image: url(../images/marble.gif)">
I like this effect so I made a class for it:
.marble { background-image: url(marble.gif)}
Then I put my class in my body tag:
<body class="marble">
I also made pages using this background-image in a div, a paragraph and a span. Check them out.