A protective case for a mobile device such as a tablet computer is disclosed that includes modular components that can be mixed and matched by the user at the point of purchase to facilitate creation of a user customizable look. The case includes a shell that is configured to retain the tablet device and a front cover that is configured to protect and conceal the screen of the tablet when the case is in the closed position. When the assembled case is in the open position and the tablet is retained within the shell, the cover is configured to stand the shell up on edge. The shell and front cover can be reversibly attached to one another by the user, so that the user can select a shell of one color, material, design, or style and a front cover of another color, material, design or style. Retention tab and slot are employed to reversibly lock the front cover to the shell to form a seamless integrated multi use mode case.