Using Theme Roller

Use Theme Roller at http://jquerymobile.com/themeroller to define your own theme without coding CSS directly. Even if you want to manually custimize the theme, this will give you are css file to use as the starting point.

Using the theme on your page

Include the theme css file after the default jquery mobile file:

<link rel="stylesheet" href="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.css" />
<link rel="stylesheet" href="my_themes.css" />
<script src="http://code.jquery.com/jquery-1.8.2.min.js"></script>
<script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script>

The set the them to be used on you pages, headers and footers:

<div data-role="page" id="Page0" data-theme="a">