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.
Yellow is the happy colour. It has been proven to stimulate the brain, helping you feel more alert and decisive. Good judgment, clear thinking and discernment and are at their best with a bright yellow.