Journal right on the photo. I also love being able to write directly on my photos. I use American Crafts Precision Pens or Slick Writers for writing directly on my photos. This is a Precision Pen in (my favorite size).
If you're searching for an easy and inexpensive easy way to decorate a wall, consider mounting a plate collage. Choose a colorful collection to brighten up a space — or light plates against a dark wall to create a uniquely sophisticated look.