Este es mi codigo:
<?php
include('config.php');
$id = 1;
$style = mysql_query("SELECT * FROM fondo_web WHERE id = '".$id."'") or die('error');
$css = mysql_fetch_array($style);
header('Content-Type: text/css');
$bgcolor = $css['bgcolor'];
$bgimage = $css['bgimage'];
$color = $css['color'];
?>
.fondo_web {
background-color: <?php echo $bgcolor ?>;
background-image: <?php echo $bgimage ?>;
color: <?php echo $color ?>;
}