Cut tulle yardage or 6-inch-wide tulle from a roll the length of the string of lights plus an additional 1/4 of the length. Lay out tulle yardage flat on a table or the floor, and cut it lengthwise into strips about 6 inches wide.
Place a string of lights down the center of a strip of tulle. Encase the light string by folding the tulle over it. Wrap a wire tie around one end of the tulle and the end of the light string, and twist the tie to secure it.
Gather the tulle in the space between the next two bulbs, creating a puff of tulle over the bulbs. Secure the tulle between the bulbs with another wire tie. Continue fastening the tulle with wire ties between the bulbs until all are covered. Adjust the puffs over the bulbs to accommodate any extra tulle, or trim off the extra.
Cut the ribbon into sections long enough to tie into bows around the light string. Tie a ribbon bow over each wire tie. Camouflage the battery pack inside a puff of tulle or a bow.