Change theme colors based on specific Login?

Hey everyone. This might be a simple question, but I couldn’t find an answer in the forum, or online. Is there a way to have different logged in users go to a specific theme or a different colored version of that theme?

I would assume it would have to be multiple versions of a theme with slight changes, but I really need a pluggin or instructions on accomplishing it. The client needs 5 different versions of the site for specific users to navigate to once logged in.

Any help is very welcome!!! Thanks,

John H