We have decided not to have a non-logged-in version of the app.
Under "My Boards" in the Main Library view, there will be a button to add a new board.
The user is given the option (probably a tooltip dropdown) to start from an existing board as a template, or start from scratch.
Start from existing board: Goes to "Select Board" modal, then goes to "Edit Board" view, prepopulated with all the widgets from the starting board.
Start from scratch: Goes to "Edit Board" view, which will be empty.
boards: they're fun
Looks exactly like a board, with the following changes: