PySide: Using standard system Icons

You can add Icons to many types of QWidgets. PySide provides you with a method to access the native system icons. A complete list of icons can be found here: PySide.QtGui.PySide.QtGui.QStyle.StandardPixmap

To apply the QIcon you need to

btn = QPushButton("Folder")
style = btn.style()
icon = style.standardIcon(QStyle.SP_DirIcon)
btn.setIcon(icon)
#or short:
btn.setIcon(btn.style().standardIcon(QStyle.SP_DirIcon))

Here a small example:

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

class Widget(QWidget):

    def __init__(self, parent= None):
        super(Widget, self).__init__()

        btn_folder = QPushButton("Folder")
        btn_folder.setIcon(self.style().standardIcon(QStyle.SP_DirIcon))

        btn_one = QPushButton("Play")
        btn_one.setIcon(self.style().standardIcon(QStyle.SP_MediaPlay))

        btn_two = QPushButton("Stop")
        btn_two.setIcon(self.style().standardIcon(QStyle.SP_MediaStop))

        btn_three = QPushButton("Pause")
        btn_three.setIcon(self.style().standardIcon(QStyle.SP_MediaPause))

        layout = QHBoxLayout()
        layout.addWidget(btn_folder)
        layout.addWidget(btn_one)
        layout.addWidget(btn_two)
        layout.addWidget(btn_three)

        self.setLayout(layout)

if __name__ == '__main__':
    app = QApplication(sys.argv)

    dialog = Widget()
    dialog.show()

    app.exec_()