If you are looking for a way to feature a statement in the living room, then you can certainly do it with a striped sofa. The simple colors will fit in any interior, while bringing visual interest in a subtle way.
If you want to freshen up a certain room, then creating an accent wall sounds like a good solution. It will help you create dimension in the space. And here, the black and white stripes can be helpful. With their contrast, you can make an awkward wall look outstanding. On the other hand, this is a cheap way for decorating too.
Tip: Use horizontal lines for visually enlarging small spaces. The eyes follow the lines and the room looks a lot bigger now.
If you want to do it with smaller steps, then you should try to enhance the space with striped details. Do it little by little. You should try with small details that are strategically placed across the room. You want to make them look blended with the space.