The picture above is one from a tv show that used to come on HGTV called "Debbie Travis: Facelift". Barrett and I both loved the "colored geometry" on the wall and that became the inspiration for the decor in his office.
I modified the design concept since he had just painted his office and purchased an 8ftx4ft sheet of peg board from the Home Depot and some hardware to mount it.
I taped off the boarder and then the boxes, the holes in the peg board served as a chalk line would have to keep the boxes squared and even, then painted over with a coat or two of white paint.
After peeling off the tape, we mounted it to the wall with 6 washers and 6 screws.