The ornamental design for a figurine accessory, as shown and described.
FIG. 1 is a front, right, top perspective view of a figurine accessory;
FIG. 2 is a rear, left, bottom perspective view of the design;
FIG. 3 is a front view of the design;
FIG. 4 is a rear view of the design;
FIG. 5 is a right side view of the design, the left side view being a mirror image thereof;
FIG. 6 is a top view of the design; and,
FIG. 7 is a bottom view of the design.
The broken lines illustrating a figurine depict environmental subject matter that forms no part of the claimed design. All other broken lines illustrate portions of the article that form no part of the claimed design.