shiplap is another fun idea!
Interior wall? Shiplap, paint, wallpaper, stencil, paneling, beadboard, board and batten.
Paint an accent wall
Shiplap or fake shiplap (as Linda suggested)
Decor or gallery wall
Here is a post of different wall trim works and shiplap too. https://lifeonsummerhill.com/farmhouse-wainscot-ideas/
Peel and stick wallpaper, vinyl decals, painted stripes