The ornamental design of a decorative baluster, as shown and described.
FIG. 1 is a side elevational view of a decorative baluster in accordance with my original design, the opposite side being identical in appearance;
FIG. 2 is a side elevational view of a first variant of the design for the decorative baluster shown in FIG. 1, the opposite side being identical in appearance;
FIG. 3 is a second variant for the design for the decorative baluster shown in FIG. 1;
FIG. 4 is a top plan view of the decorative baluster shown in FIGS. 1-3; and,
FIG. 5 is a bottom plan view of the decorative baluster shown in FIGS. 1-3.