A great way to bring interest to a plain apartment wall is to design a wall collage, and an especially unique idea is a mirror wall collage. I love the idea of finding old mirrors at flea markets or garage sales and collecting them for a collage. You can also find inexpensive mirrors of different sizes in department stores as well.
Love this mirror wall collage idea for a blank wall of a stairway in a townhome or house. Keeping all the frames the same color by simply painting them to match the wall creates an interesting decor design.
Images found on Pinterest.