The ornamental design for a decorative bottletopper, as shown and described.
FIG. 1 is a perspective view of a decorative bottle topper showing my new design.
FIG. 2 is a larger scale perspective view from above, thereof.
FIG. 3 is a larger scale perspective view from below, thereof.
FIG. 4 is an elevational view of one side thereof. The opposite side is a mirror image thereof.
FIG. 5 is a top plan view thereof.
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is an exploded perspective view from the bottom thereof.
The broken line elements in FIG. 1, depicting flowers, banners and other elements projecting from the top thereof, are environmental background objects, and are not a part of my new design.