Yes, we have some :)

For example at this page: http://wednesdaysheroes.com/batwoman-trading-card-richard-cox/
You have a product image link has a rel=”group” attribute like that
a class="zoom product_main_img" href="http://wednesdaysheroes.com/wp-content/uploads/2013/09/final-final.jpg" title="" rel="group"

I don’t know what kind of script/theme you are using but iIf you have an option to modify this rel attribute from “group” to “lightbox”, do so. If not, you may modify the selector in lightbox settings the otherwise -just change “lightbox” into “group”. Or there is a third option – manually add rel=”lightbox” to images in your theme (modifying theme files).