Risers
Stair risers are actually a great place to add some color and energy without too much work. Pick something that suits your taste but stands out: a lighter color, a dark color, or an interesting pattern works well.
If you want to really draw attention to it, paint the risers in different colors or patterns—a separate design for each riser.
Checkerboard Floor
There are a lot of places in your house in which an unexpected pattern could be a huge benefit to the space. It might be a hallway, a landing, or a nook, but if there's somewhere in your house that feels boring, adding a checkerboard pattern is a good way to inject energy and youthfulness into the space.
You can do this with a checkerboard rug or, if you're artistic, paint the pattern on yourself. It is imperative to use painter's tape to mark off the pattern, though!
Have you ever used something bold on your floor? Does it sound interesting? Give it a shot, and you might be surprised how much you like it!