These wood wall tiles from Everitt & Schilling come in a variety of patterns, woods and finishes and give a beautiful depth and warmth.

Many of the tile patterns are not square so this is a great way to hide panel seams.  I am just not sure what the application method would be to easily remove them post show.
The sheer variety if fantastic and can be used to create a light modern space or a more antique rough hewn environment.

Thanks to Design Milk for this one.