The ornamental design for a decorativeornament, as shown and described.
FIG. 1 is a perspective view of a decorative ornament of the new design, showing the ornament in an open position;
FIG. 2 is a perspective view of the decorative ornament of FIG. 1, showing the ornament in a closed position;
FIG. 3 is a top view of the decorative ornament of FIG. 1, showing the ornament in an open position;
FIG. 4 is a top view of the decorative ornament of FIG. 1, showing the ornament in a closed position;
FIG. 5 is a front elevation view of the decorative ornament of FIG. 1, showing the ornament in an open position, the right side, left side and rear views being identical;
FIG. 6 is a front elevation view of the decorative ornament of FIG. 1, showing the ornament in a closed position, the right side, left side and rear views being identical;
FIG. 7 is a bottom view of the decorative ornament of FIG. 1, showing the ornament in an open position; and,
FIG. 8 is a front elevation view of the decorative ornament of FIG. 1, showing the ornament is a closed position.