Class portfolios: Can each student change their theme?

I am assisting a faculty member who is teaching an online portfolio class. One of her requirements is for each student to have the creative freedom to change the look and feel of their online portfolio, yet she wants the portfolios to have a peer-review component and centralized management. I'm looking into Omeka at the instructor's request, but I don't think it is possible in Omeka for each contributing user on an Omeka site to have their own uniquely-styled area. Can anyone confirm this? Thank you.

Exhibits in Omeka can have separate themes, and so if the exhibit structure works with the possible structure of a portfolio, that is easily doable.