use clip or pants hangers to display photos or printed posters (By Fryd)
A Plethora of Creative Ways to Display Your Favorite Photos | Apartment Therapy
A nice option is offered on artifactuprising. If you want to create a similar display, use small wood stumps and string. Create as many rows and columns as you’d like.
27 The Cheapest & Easiest Tutorials To Make Astonishing DIY Wall Art
For all the pictures you have...and no frames to put them in. def doing this!
Cool way to display pics
Decoracion con cuadros
Cable poster hanger
Another interesting idea is to alternate black and white photos with color photos. Print them with the same dimensions and shape and create a symmetrical display on a wall of the living room. A wall adjacent to the windows would be great.