Tony if you use the one that is 6 euros its a platform in php to create many variations of the templates for whatever you need.
YOu can add custom graphics, choose where to place the code to call the images, the add to bag button etc giving you a full custom layout.
If its the cat page you wanna make your own its really simple, have a look in the templates folder of VM and you will see how simple the code is to edit.
A few extra divs here, a cgraphic here and some css and you can make your own templates easily, just drop them into the same folder for htem to become a choice in VM backend
There is a really good CSS based one which means you can easily edit it to your needs
here an example of what we did with it
www.redbaguk.com
Storm