change background when logged in

place this after the body tag in the header
make sure you dont have a body in your css

<?php if ( current_user_can('read') ) { ?>
<style type="text/css">
body {
	background-image: url(<?php bloginfo('stylesheet_directory'); ?>/images/bg.gif);
	background-repeat: repeat-x;
	background-position: top;
	}
</style>
<?php } else { ?>
<style type="text/css">
body {
	background-image: url(<?php bloginfo('stylesheet_directory'); ?>/images/bgnonmember.gif);
	background-color:#ECECEC;
	background-repeat: repeat-x;
	background-position: top;
}
</style>
 <?php } ?>

i think it’s a awesome trick,