My parents are in the process of renovating a 19th century farm house. We visited this past weekend and I liked seeing the restoration at this point- half stripped down to the bare plaster walls with layers of wall paper from over the years partially removed. Decades of papers were exposed, including the 1920s art deco 'fan' paper seen in the left image below. The green wall exposed is the original paint colour from the first time the plaster was painted in the 1800s. The dining room was stripped right to the bare plaster, which I liked the look of.