This is one different way to add style to a wall or a ceiling. There’s some different treatments:
Panel molding: wood trim over plain walls/ceiling.
Chair rail: wood molding that’s attached horizontally around the perimeter of a room.
Wainscoting: panel molding with decorative purposes that lines the lower portion of a wall. One type of wainscoting is board and batten which offers a nice modern look and adds value to a plain wall or ceiling.
Shiplap: wooden board with pieces fitting together with a natural gap the size of a nickel. It’s incredibly versatile in application .
Beadboard: narrow planks in rows lined up against each other. In between the wood planks there is an indentation called bead. It can de installed both on the walls and on the ceiling.