The Simplest Wall Design Ever

There is a wall in my home that's about 10 ft long and 4 feet tall. It's adjacent to an under-the-stair space with a vent, which has inevitably become a Nook for our kids' (that I have clearly decked out, and will do a reveal of next week). I've wanted to do something with this wall, both to extend the kids' play area a bit, and to balance out the room.