Accessory for Portable Electronic Device

FIG. 1 is a front, left and bottom perspective view of an accessory for portable electronic device of our new design; FIG. 2 is a rear, right and bottom perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a rear view thereof; FIG. 5 is a top view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is left side view a thereof; FIG. 8 is a right side view thereof; and, FIG. 9 is another front perspective view thereof, showing a stand of the accessory for portable electronic device in an open state. The broken lines shown in the drawings depict portions of the accessory for portable electronic device that form no part of the claimed design.