title: how to create a theme with QT
body: <p>im looking for a way to make my pyqt interface look nicer by adding a theme to it. <br>
  im new to Qt and i still have no idea how to add a custom theme for widgets.. so how is that possible ?  <br>
  and is it possible through qt designer ?  <br>sorry for my bad english , its my third language. i hope the idea is clear enough .<br> please let me know if something was unclear .. <br> thanks in advace</p>