Using old picture frames to hang photos ‘out to dry’ is a great idea. Large old frames can be gotten cheaply if you do not have any from yard sales and thrift stores. You could paint these all the same color or use them as is. Using twine or clothesline string several lines across the frames width. Using small clothes pin that can be purchased fro Amazon or Michaels/Hobby Lobby clip your favorite photos up. You can change them as often as you like.