If you're bored with normal photography, there's a wide range of effects and fun you can explore - and one of these is time-lapse photography. By taking regular exposures over a period of time you can capture various things like flowers opening, the movement of clouds and more. And doing so is very easy with an Arduino. One example a time-lapse controller has been documented by Instructables user "hacker3455" with a simple circuit that fits on a standard protoshield.
The creator has spent some time to not only document but also design a simple user-interface for the controller so anyone can use it. With two buttons and a single-digit display the period between exposures can be set in a jiffy, as shown below: