In our web-app there is a message centre with a time-line of communications. We let the user move instances of these into what we are calling an archive. On each of the listed messages there appears a small icon to effect this action.
The user can at any time switch to a view of their archive, which behaves exactly the same as the normal inbox except now there is an icon to restore individual messages back to the inbox.
In our draft non-release prototypes we've just been using a small trash can icon to represent archive, but of course this isn't ideal.
Any suggestions for an alternative pair of icons to use?
edit: The user can switch between the active inbox and the archive at any time via a two-state view switcher button, located just above the list of messages. The two buttons would contain both the icon for the view and the name of the view.
So .. arrows on the icons pointing right for archive, and left for restore, would also gel. Just need those root icons now and the responses below answer that quite well.