I really like this outfit and the sweater! Cozy in Chambray. Knit cardigan over a denim shirt. Pair with black leggings with tall leather boots and long knit socks. Add an infinity scarf that matches color-scheme for a look thats put together.
A piece of plywood painted with the chevron(Or any pattern)--its a big statement that's cheap and its not an entire wall that you have to commit to. Possibly have this done on accent walls on smaller corner walls by entrance and laundry room.