Subcategories page

Hi Greg,
Great plugin, really cool job.

Is there a way to add a page with the subcategories?

What I mean is, I have categories and then subcategories and I would like the user to be able to see the categories as they are now, all the squares with the icons.
Then they will choose the category they want and will see a page where they′ll have all the subcategories inside that parent category, in the same square icons style display.

Can that be done?