Hexagon Wall Shelves Diy . Spray paint the boxes (a couple of layers, i did 3), wait for them to dry. We cut each piece to be 5.5″ on the long side. Hexagon shelves set, Hexagon shelf set, Geometric shelf, Floating from www.pinterest.com A nail and a hammer. Someone sent me the idea to do a hexagon shelf wall and i fell in love. If you are hanging them separately you can use sawtooth hangers to hang your shelves.