FIG. 1 is a front perspective view of a cover showing our new design, with an environmental electronic device shown removed from the cover;

FIG. 2 is a front perspective view thereof, shown without the environmental electronic device;

FIG. 3 is a rear perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is right side view thereof;

FIG. 8 is a top plan view thereof; and,

FIG. 9 is a bottom plan view thereof.

The broken lines in the Figures show portions of the cover and an exemplary electronic device which are for the purpose of illustrating portions of the cover and environmental structure that form no part of the claimed design. Examples of an electronic device with which the claimed design may be used are a computer, a portable or hand-held device, a personal digital assistant, a communication device (e.g. cellular phone), a novelty item, toy, and/or the like.