Go to Home Depot, get a 4x4x8 pressure-treated lumber cut into squares, sand down edges, adhere with wood glue, paint black/red/grey, adhere together, put wall mounts on back, hang on wall above the tv
I love how they were able to create an interesting feature by using ordinary cables. Is not often what actually takes away from the space all these cables hanging everywhere well just make the best out of it!