Ben Huson

This plugin displays cross sales in WP e-Commerce. It provides the same functionality as in earlier versions of WP e-Commerce plus a little bit more.
Doesn’t do anything yet but will replace the current WP e-Commerce ‘also bought’ functionality in version 3.9+
New features include:
<ul>
<li>Option to set cross sale image sizes.</li>
<li>Remove hardcoded styling so it’s easier to style via css.</li>
<li>Improved code structure.</li>
</ul>
PS: You’ll obviously need WP e-Commerce installed for this to do anything 😉

WP e-Commerce Cross Sales (Also Bought)

This plugin displays cross sales in WP e-Commerce. It provides the same functionality as in earlier versions of WP e-Commerce plus a little bit more.

Jacob Schwartz

This plugin lets you style the automated emails that WP e-Commerce sends to your customers, using a simple theme template file. 
It’s a little like gift wrapping all your communications. 
To use this plugin, you don’t need to know how WP e-Commerce does its emailing, nor necessarily any php. 
You DO need to know how to edit your WordPress theme, including what a theme template file is. 
The plugin’s settings page walks you through the rest. 
This plugin works with the WP e-Commerce customer emails for:
<ul>
<li>Purchase Reports</li>
<li>Purchase Receipts</li>
<li>Order Pending</li>
<li>Order Pending: Payment Required</li>
<li>Shipping Tracking Notifications</li>
<li>Unlocked Files (for download purchases)</li>
</ul>
This plugin can also be used to style the other emails that WordPress sends out (blog subscriptions, user registrations, contact forms, etc).
This plugin has an admin page where you can activate live email styling (after your private design testing) or send yourself a test styled email. 
In order to maintain readability, line breaks in any original content are automatically replaced with tags.
Here’s a simple example of what you might put in the wpsc-email_style.php theme template file:
<pre><code><html><body>
<h2 style="color:#016E0F"><?php echo ecse_get_email_subject(); ?></h2>
<?php echo ecse_get_email_content(); ?> 
</body></html>
</code></pre>
Of course, you’ll want to add a lot more html, css and maybe even php to achieve your own style. 
You may want to consult the ‘nets about how html works inside emails.
Are you familiar with the WordPress template hierarchy theming system? 
This plugin creates a template hierarchy just for emails, 
allowing you to get fancy and separately style each kind of email. 
Or you can just stick to the single wpsc-email_style.php theme template file and keep it simple.
Do you want to style customer receipt content beyond what WP e-Commerce allows in it’s admin settings tab? 
This plugin allows you to template the content of customer receipts to make them beautiful, 
and even includes a sample set of theme template files for you to copy and adapt as you wish.
The plugin’s other home on the web is over at <a href="http://schwambell.com/wp-e-commerce-style-email-plugin/" rel="nofollow ugc">Schwambell</a>.

WP e-Commerce Style Email

Style the emails that WP e-Commerce sends to your customers.

WP e-Commerce Cross Sales (Also Bought) vs WP e-Commerce Style Email