A decorative shutter assembly including a plurality of main slats arranged in side-by-side relation, end pieces positioned at each end of the main slats and each including laterally spaced tongues spaced and sized to fit in their respective open ends of the main slats at a respective end of the main slats, and cross slat structures positioned in overlying relationship to seams formed between inboard ends of the end pieces and the respective ends of the main slats. The cross slat structures are removably secured to the end pieces and to the main slats so that, following delivery of the shutter assembly to a building site, the cross slat structures may be removed, the end pieces and main slats may be secured to a building surface utilizing fastener members, and the cross slats may be repositioned over the fastener members to conceal the fastener members.