I purchased a set of 24 Shawntella (6” X 6”) vinyl peel  stick field tiles.
I peeled  stuck them on the side of staircase being that I have open steps. I’m gonna order another set of 24 to add one in the middle of them. 
It was a fun project and so easy, but it takes a little patience peeling off 
the back of sticker. They are so colorful!!