We claim the ornamental design for a lug nut cover, as shown and described.
FIG. 1 is a perspective view of a lug nut cover, showing our new design mounted to a lug nut;
FIG. 2 is an exploded perspective view thereof;
FIG. 3 is a front elevational view thereof, the lug nut omitted for clarity of illustration, the rear elevational view, left-side elevational view, and right-side elevational view all being identical thereto;
FIG. 4 is an enlarged top plan view of FIG. 3;
FIG. 5 is an enlarged bottom plan view of FIG. 3; and,
FIG. 6 is a cross-sectional view, taken along lines 6--6 of FIG. 3.
The broken lines in the drawings illustrate portions of the lug nut cover that forms no part of the claimed design.