this idea will exchange any character 'e' in your blog title and wrap it into a span with the style: color:white;
using the php function: str_replace().
first step:
<?php $blog_title = get_bloginfo('name');
//loads the blog title into a variable//
$blog_title = str_replace('e','<span style="color:#fff;">e</span>',$blog_title);
//replaces 'e' and surrounds it with a span with color white//
?>
second step:
output the new title echo $blog_title; instead of bloginfo('name');.
so, in your 'header.php' find this:
<div id="headerimg">
<?php if (is_front_page()) { ?>
<h1><a href="<?php echo get_option('home'); ?>"><?php bloginfo('name'); ?></a></h1>
<?php } else { ?>
<a href="<?php echo get_option('home'); ?>"><?php bloginfo('name'); ?></a>
<?php } ?></div>
change it to this:
<div id="headerimg">
<?php $blog_title = get_bloginfo('name');
$blog_title = str_replace('e','<span style="color:#fff;">e</span>',$blog_title); ?>
<?php if (is_front_page()) { ?>
<h1><a href="<?php echo get_option('home'); ?>"><?php echo $blog_title; ?></a></h1>
<?php } else { ?>
<a href="<?php echo get_option('home'); ?>"><?php echo $blog_title; ?></a>
<?php } ?></div>
hope it works ;-)
see it here