Lay the wall hanging on your work surface. Pretend the tape measure is the ribbon. Use it to create a loop from one corner of the frame to the other with the desired height to determine how much ribbon you will need. Add 2 inches to that length. You will use the extra length to fold the ends.
Cut your ribbon to the determined length. Fold both ends of the ribbon 1/2 inch. Fold them another 1/2 inch. Staple each folded end to one of the top corners of the frame, using a staple gun.
Cut a 36-inch-long piece of ribbon if you would like a bow. Tie the bow at the center of the ribbon you've attached to your frame.
Hang your wall hanging from the loop, using a hammer and nail. Remember to hammer in the nail at a height equal to the height of your ribbon loop. You want your wall hanging to be at eye level. So if your ribbon loop is 6 inches high, the nail should be 6 inches above where you want the wall hanging to be.