The Kiss (Klimt)
Klimt was a Symbolist artist and this painting was part of his Golden Period.  Klimt went to the Basilica of San Vitale in Ravenna, where he saw Byzantine art, which also uses gold.  Also, his father and brother were metalworkers.  This is another reason why he liked to use gold leaf in paintings like The Kiss. Japanese prints also affected the way Klimt made the painting.