I don't know if it will be completely useful for you, but I wrote a little tutorial on using Qt4 with Python with some examples here:
https://github.com/awesomebytes/python_qt_tutorial
It doesn't specifically use ROS, but you can find a couple of packages that do use PyQt4 and ROS that I made some time ago:
https://github.com/uts-magic-lab/reem_movements_creator
https://github.com/pal-robotics/learning_gui
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