They bought a 4’x100′ role of black landscape fabric, cut it to the needed lengths, then used brooms to randomly splatter flat white paint on them. Then they attached 4′ long 1″x2″ black wood slats to the top and bottom. These wood slats allowed the fabric panels to simply hang off 3″ screw set in the walls. The set was lit with 9 ADJ Mega Tri Bars, 8 Elation Opti Tri Pars, and 2 Elation Platinum 5Rs.
main wall See how the background is painted dark before installing wood slices and the edges are trimmed to fit the wall--dont overhang the edge - http://www.homedecoratings.net/main-wall-see-how-the-background-is-painted-dark-before-installing-wood-slices-and-the-edges-are-trimmed-to-fit-the-wall-dont-overhang-the-edge