To extract the COD theme install files this requires you to still have the BB OS files because that's where the cod files come from. You still need to be in C:\Program Files\Common Files\Research in Motion\Shared\Loader Files\XXX Your Phone/OS XXX\. If you don't have those folders then you need to go to BB.com and download then install your OS. Once you get to the end of the file install just cancel it.

In the Blackberry.ALX file that was to be modified before to remove the VendorID so all themes could be loaded there is the Theme.COD filenames. You can see them right below each of the VendorID Lines:
Code:
                <!-- Bell Mobility Canada filesets -->
                <fileset Colour="True" series="8800" radio="CDMA-GPRS" Java="1.0" _vendorID="109">
                         <files>
                                net_rim_theme_109_zen_320x240_b.cod
                        </files>
                </fileset>
The net_rim_theme_109_zen_320x240_b.cod is the Bell Mobility Canada fileset install file. Now all you need to do is find it and create an net_rim_theme_109_zen_320x240_b.alx file for it.
The .cod file can be found in the Java folder. This is where BB stores all of their cod files so have fun. Once you've extracted the .cod file you need to hack an .alx file to use it. Don't worry, this is easy.
Code:
<loader version="2008.01.04.2215">
 <application id="net_rim_theme_109_zen_320x240_b.cod">
  <name>net_rim_theme_109_zen_320x240_b.cod</name>
  <description>An 8830 theme for version 4.2.2</description>
  <version>2008.01.04.2215</version>
  <vendor>Plazmic Inc.</vendor>
  <copyright>Copyright (c) 2001-2007 Plazmic Inc. All Rights Reserved.</copyright>
  <fileset Java="1.0">
   <files>
    net_rim_theme_109_zen_320x240_b.cod
   </files>
  </fileset>
 </application>
</loader>
Open up your Desktop Media and install the ALX file and you're good to go! You can rename the files and change them as you like but you do need to make an ALX file for your COD because BB doesn't supply them.
I didn't extract and make alx files then post them because I didn't know how that would be covered with the whole property rights and the forum mods.