A croisant?

SQL Server 2005 uses an icon of 2 people to indicate a role.

>Hi everybody,
>
>Our application has a login screen upon startup, so the user can pick up a role. We would like to be able to switch roles without exiting the application. I want to add a button on our main toolbar to switch roles. I'm thinking what kind of picture can I put on a toolbar button?
>
>What would be your ideas?
>
>Thanks in advance.