A while back I visited the Seattle Art Museum with friends. I studied a landscape that had been turned on it's side.. a graphic face was painted over the scene. The card next to the painting indicated that this particular artist would buy paintings from stores like Goodwill and then "find" another scene in it to highlight. The artist left much of the original painting intact but painted his own addition on top. (I wish I'd made it a point to remember the artist's name!).
I used a wood panel for a palette recently for acrylics. Tonight I "saw" a face in the old dried up paint and I painted it on top of the palette...(thinking of that Seattle Art Museum painting for inspiration).
Celeste Bergin, What appears, 2010, Oil over acrylic palette,l 8 x 10 inches