Well you can go with a standard solution:
<ul data-role="listview" data-theme="c" data-inset="true">
<li><item 1/li>
<li>item 2</li>
</ul>
Or you can go all commando like this:
.ui-listview {
margin: 20px !important;
}
Working example: http://jsfiddle.net/Gajotres/2PhBQ/