Hi I have a TV on my wall and need to house cable box etc. open look.

You can pick up a couple of wooden crates that are available everywhere now, (Walmart, michaels, joanns, hobby lobby) Paint or stain them in the color of your choice and screw them into studs under the TV.

Check thrift stores and if it's not the right color spray it !

Get some reused brick, get a long board or two to make shelves the width and depth you want. Sand and finish the wood they way you see fit to go with your décor. Stack the bricks according to the height you want each shelf until you reach the number of shelves you want under the TV. My Mom had bookshelves she made this way since the 60's, when she moved to a smaller place I got them and I am still using them. Mine are ten feet long, with only four stacks of bricks going up and three shelves, but they are as steady as can be. You can take apart and reconfigure all you want.

Thought maybe this idea would go with the country feel. The reused brick would look more country and the cinderblocks many look more industrial and may not go quite as well. Reused brick is more multi-colored and weathered looking.

Depending on your budget , make or buy floating shelves.