I’ve been seeing a few modern interiors of late choosing plywood instead of drywall as interior room walls. I’m not sure how cost effective it is, especially considering it all depends on the type of grain you choose, but I do have to say I’m liking the warmth and pattern it gives to a room, especially when contrasted with the dark floor as shown on right.
(photo credits: right, Maison Bois Fourneville, really worth taking a look…on left, PS Arkitektur Fjä llhus)