The ornamental design for a cover for light and/or fragrance emitter, as shown and described.
FIG. 1 is a front perspective view of a cover for light and/or fragrance emitter showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The trees shown in broken lines are for environmental purposes only and form no part of the claimed design. The remaining broken lines represent unclaimed boundaries of the design.