Create your own background

Use this code:

<style type="text/css">
body {
background-image: url(INSERT URL HERE);
background-position: center center;
background-repeat: repeat;
}
</style>

Remember to insert your URL. If it's one tile you want to tile across and down the page like a checkerboard have "background-repeat :repeat;". Whereas if it's one big image have it as "background-repeat: none;".