We didn't do the walls, only the Digital Environment (lighting, shades, audio, video, etc.). However, if we recall, the wall behind the headboard is linen textured wall paper. It was very clean and seamless.

who makes the bed? where can it be purchased? How much is it?

I'm sorry, we tried to find out for you but the only thing we could find is the interiors were done by Discovery Home Services. Googling that comes up empty-handed. If we knew more we'd be happy to share, but we're a home technology firm. Often time we work really close with the interior designers, because technology integrations need to fit within the aesthetics of the environment, but in this case we finished the project before the interior designers came in. Good luck, it is a gorgeous bed, we agree.