Yet another late-medieval mural has been just discovered under 27 (!) layers of whitewash in a church in Wales. Check out the BBC News Magazine story and video: http://www.bbc.com/news/magazine-25214557.
The murals feature St. George slaying the dragon (teaching you what to do) and representations of the seven deadly sins (teaching you what not to do).
Picture below from David Clayton, “15th Century Wall Paintings Uncovered in a Small Welsh Church” New Liturgical Movement, posted November 18, 2014, accessed November 19, 2014, http://www.newliturgicalmovement.org/#911122532120533799: