My house is going to be all glass with a huge open atrium with a maple tree planted in the middle. There's also going to be a little pond and waterfall that my dad is going to build for me. The pond is going to be filled with vibrant koi fish that my kids are going to pick out.
Pull out Wardrobe Rail for under stairs. You could have a few of these attached under the higher stairs and some storage boxes or even a chest of drawers underneath, then you could do away with the black frame and the room would look / be much larger.