from PyQt4.QtGui import *
from PyQt4.QtCore import *
import sys
app = QApplication(sys.argv)
class Window(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)
        pal = window.palette()
        pal.setBrush(QPalette.Normal,QPalette.Window,QBrush(image))
        window.setPalette(pal)
if __name__ == '__main__':
    w = Window()
    w.show()
    sys.exit(app.exec_())