QSlider

import sys
from PyQt4 import QtGui, QtCore

class Example(QtGui.QWidget):

    def __init__(self):
        super(Example, self).__init__()

        # mainlayout
        hbox = QtGui.QVBoxLayout(self)

        # background
        self.bgColor = QtGui.QColor(0, 0, 0)
        self.bg = QtGui.QFrame(self)
        self.bg.setGeometry(0, 0, 300, 300) # クライアント座標
        self.bg.setStyleSheet("background-color:%s" % self.bgColor.name())

        # palette
        pallet = QtGui.QPalette(self)
        pallet.setColor( QtGui.QPalette.Foreground, QtCore.Qt.white )
        # top components
        lbl1 = QtGui.QLabel("TicksBothSides : Red", self)
        lbl1.setPalette(pallet)
        sld1 = QtGui.QSlider(QtCore.Qt.Horizontal, self)
        sld1.setObjectName("red") # オブジェクト名をつける
        sld1.setFocusPolicy(QtCore.Qt.NoFocus)  # フォーカスを移さない
        sld1.setRange(0, 255)
        sld1.setTickInterval(10) # 目盛の間隔
        sld1.setTickPosition(QtGui.QSlider.TicksBothSides) # 目盛の位置
        sld1.valueChanged.connect(self.changeValue)

        # middle components
        lbl2 = QtGui.QLabel("TicksAbove(TicksLeft) : Green", self)
        lbl2.setPalette(pallet)
        sld2 = QtGui.QSlider(QtCore.Qt.Horizontal, self)
        sld2.setObjectName("green")
        sld2.setFocusPolicy(QtCore.Qt.NoFocus)
        sld2.setRange(0, 255)
        sld2.setTickInterval(15)
        sld2.setTickPosition(QtGui.QSlider.TicksAbove)
        sld2.valueChanged.connect(self.changeValue)

        # bottom components
        lbl3 = QtGui.QLabel("TicksAbove(TicksLeft) : Blue", self)
        lbl3.setPalette(pallet)
        sld3 = QtGui.QSlider(QtCore.Qt.Horizontal, self)
        sld3.setObjectName("blue")
        sld3.setFocusPolicy(QtCore.Qt.NoFocus)
        sld3.setRange(0, 255)
        sld3.setTickInterval(50)
        sld3.setTickPosition(QtGui.QSlider.TicksBelow)
        sld3.valueChanged.connect(self.changeValue)

        # add widget
        hbox.addStretch() # 間隔を調整
        hbox.addWidget(lbl1)
        hbox.addWidget(sld1)
        hbox.addStretch()
        hbox.addWidget(lbl2)
        hbox.addWidget(sld2)
        hbox.addStretch()
        hbox.addWidget(lbl3)
        hbox.addWidget(sld3)
        hbox.addStretch()

        self.setLayout(hbox)
        self.setGeometry(300, 300, 300, 300)
        self.setWindowTitle('QSlider')
        self.show()

    def changeValue(self, value):
        objectColor = self.sender().objectName()
        # 関数ポインタハッシュの作成
        funcMap = {
            "red":self.bgColor.setRed,
            "green":self.bgColor.setGreen,
            "blue":self.bgColor.setBlue
        }
        funcMap[str(objectColor)](value) # QStringから文字列方へキャスト
        self.bg.setStyleSheet("background-color: %s" % self.bgColor.name())

def main():

    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

ラベルに色をつけるにはQPaletteを使用するらしいです。