from PySide.QtGui import *
from PySide.QtCore import *
import sys

def getPalette():
    palette = QPalette()

    brush = QBrush(QColor(80, 80, 80))
    brush.setStyle(Qt.SolidPattern)
    palette.setBrush(QPalette.Active, QPalette.Button, brush)

    # THIS SETS THE FONT TO WHITE ON WINDOWS BUT NOT ON OSX
    brush = QBrush(QColor(255, 255, 255))
    brush.setStyle(Qt.SolidPattern)
    palette.setBrush(QPalette.Active, QPalette.BrightText, brush)

    return palette

def getStyleSheet():
    return """
QPushButton{
background-color: rgb(80, 80, 80);
}

QPushButton:active{
color: rgb(255, 255, 255);
}
    """

app = QApplication( sys.argv )
app.setStyle( 'plastique' )
app.setStyleSheet( getStyleSheet() )

w = QWidget()
b = QPushButton( 'test' )
w.setLayout( QHBoxLayout() )
w.layout().addWidget( b )

w.show()
sys.exit( app.exec_() )