Colour washing, frottage, sponging, are all faux painting techniques that will create a mood or the illusion of texture on a plain wall which are brought to life by the magic of a brushstoke.
source : http://www.home-hunts.net/june-2009-newsletter/property-people-painted-creations/
source : http://www.home-hunts.net/june-2009-newsletter/property-people-painted-creations/