We are big fans of leaning posters and framed art against the wall, it is a low commitment way to add a variety of prints to your space and so easy to change! These graphic prints look great with the mesh backdrop and some textiles to soften.
Kitchen or anywhere DIY. Seems simple enough, depending on your gap between shelves, anywhere from ropes to ropes for your spacing. You could even use wider wood, just adjust your rope length to accommodate your width and height of your shelves.