Santuario de Misericordia, site of the botched Ecce Homo restoration

The Ecce Homo (Behold the Man) in the Sanctuary of Mercy church of Borja, Zaragoza is a fresco (mural painting) by Spanish painter Elías García Martínez depicting Jesus crowned with thorns. Both the subject and the details of its treatment are widespread in some forms of religious art.

Press accounts agree that the original painting was of little artistic importance, and its fame relates to a botched attempt at restoration.

http://en.wikipedia.org/wiki/Ecce_Homo_(El%C3%ADas_Garc%C3%ADa_Mart%C3%ADnez)