More to explore:
Reverse canvas wall pockets. So easy to make!
DIY Cardboard Wall Pockets
cardboard type (via @Nicole Underwood)
Need some inexpensive wall art ideas? Here are 39 of them.
Cool Cardboard Kit On Etsy
paper wall pockets
raised plaster stencil wall.
ROPE WALL? I don't know about inside, but I'd love to do this on both ends of the back patio!
wall pockets made of cardboard