Using wood from pallets to create a barn-wood wall. (well, it looks like barn wood, but it& not.) Would work well with some of the other ideas in here. (painting or staining certain areas of wood, wood on ceiling? Or would it be too heavy?
Tiny House window trim and beetle-kill / blue-stain pine wall paneling detail. Look at the range of colors in the pine! Shane really made a feature wall on the back highlighting the natural grain in the pine tongue-and-groove.
Reclaimed barnwood wall- basement stairs - love this idea for a spot that is hard to decorate. [we're changing the varnished plywood wall next to the stairs, i wonder if we could do a bit of this idea. or a textured wall paper]
DIY Shiplap Wall...Easy, Cheap, and Beautiful Part 1