"Hitler often claimed to be something of a frustrated artist, and art was certainly one of his major interests throughout his life. He probably sold several thousand paintings and postcards during his stay in Vienna, some of which turn up even today. Hitler himself made no great claims to greatness as a painter (architecture was something else....). There was a thriving market for his paintings during the Third Reich — and even today, there are eager collectors."

http://www.bytwerk.com/gpa/hitlerpaintings.htm