Those are floating shelves, custom made with 2x4 lumber and covered with dry wall please click on the link below and scroll down to see step by step detail pictures.

As for the media cabinet I designed two different cabinet styles in different color and and used black Caesarstone on top.

[https://www.houzz.com/discussions/any-one-know-how-to-get-the-media-stand-and-wall-behind-the-tv-dsvw-vd~1052052?n=3[(https://www.houzz.com/discussions/any-one-know-how-to-get-the-media-stand-and-wall-behind-the-tv-dsvw-vd~1052052?n=3)

Imitation is the sincerest form of flattery. You're design has inspired us. Thank you!!!

where did you get the stone wallpaper? Is there a link?

Could you please tell me the name/manufacturer of the curved light fixture in the great room? Thank you.