The ornamental design for a decorativepiece, as shown and described.
FIG. 1 is a front perspective view of a decorative piece showing my new design;
FIG. 2 is a front view of the decorative piece shown in FIG. 1;
FIG. 3 is a rear view of the decorative piece shown in FIG. 1;
FIG. 4 is a right side view of the decorative piece shown in FIG. 1;
FIG. 5 is a left side view of the decorative piece shown in FIG. 1;
FIG. 6 is a top view of the decorative piece shown in FIG. 1;
FIG. 7 is a bottom view of the decorative piece shown in FIG. 1; and,
FIG. 8 is a front perspective view of the decorative piece shown in FIG. 1, shown in the environment of a handbag;
The broken line showing of the body of the handbag, star piece, and backing plate is for illustrative purposes only and forms no part of the claimed design.