Hey OS, I actually didn't use a striped wallpaper, I used a wall covering called "barn wall with pilaster" in the panelling section. It comes in two flavors, on with the pilaster one the left and one with the pilaster on the right. That way, I can paint a stripe with a border effect. In this specific case I used a stone texture on for the wall and wood for the pilaster.
For the floor, I used, "squares with border" in the misc. section. I applied the textures of the wall to the floor and then rotated it to get the border on both sides.