New Blog Templates at Signup

I have created 1 New Blog Template (using the plugin). I plan to create more "New Blog Templates". Right now if someone goes to my site to sign up, they do not have the option to select a "New Blog Template" nor does the new account default to the created "New Blog Template". It works fine from the admin side but want to have the ability for the customer to select which "New Blog Template" they want. I plan to have a "New Blog Template" for each of my templates because each template displays content differently base on the blog settings.

Does this functionality exist somehow? Or am I stuck with setting the user with the "New Blog Template" from my admin panel?

Thanks!