Since arched windows come in multiple shapes and sizes, it is important to find the right interior shutters that can be customized to fit perfectly on your windows. The color and shade should match the decor of your house and blend in with the same. If it stands out like a sore thumb, it spoils the whole look.
While on the interior, you should worry about looks, controlling the natural light coming in and ventilation is also a point to keep in mind. Privacy is to be kept in mind while choosing arched interior shutters for say, a bedroom. Find the right ones that allow you to control the light flow.