The ornamental design for an ornamentbase for a shoe, as shown and described.
FIG. 1 is a top perspective view of an ornament base for a shoe showing my design in conjunction with a clog type shoe;
FIG. 2 is a side and top perspective view thereof;
FIG. 3 is a plan view thereof;
FIG. 4 is a front elevation view thereof, the rear view being a mirror image;
FIG. 5 is a left side elevation view thereof, and right side is being a mirror image;
FIG. 6 is a bottom perspective thereof; and,
FIG. 7 is a top perspective view of an ornament base for a shoe showing my design in conjunction with a shoelace type shoe; with the shoelace laced through the ornament base hole.
The broken lines shown in all figures are for illustrative purposes only and form no part of the claimed design.