To give that relaxed highlight in a more neutral environment is a good option.
If you think the stairs are missing something, maybe bet on the tile stickers for the mirror on the stairs.
On the "fronton" of the sink or backsplash, it will transform the kitchen, just with the stickers the change is already considerable.
For the entrance hall it is a super simple, affordable idea that makes a lot of difference.
For monochrome kitchens, a touch of color can be achieved by using tile stickers on the cabinet.
Another way to use the stickers is to redesign the furniture, it also gives the environment a new look.