I agree, the ONLY thing that bugs me about my Civic are the rattles. The main one is coming from the passenger seat base.
The car went it to the dealers on Monday to fix it, but they could not hear it! They said they had spoken to Honda and there were no known issues. In fact the car was free from ALL rattles during the test drive with technician, but as soon as I got it home they started again!
Really annoying! 
Not sure what to do next!
PS The Jazz they gave me was a solid as a rock, so what does that tell you. Honda should not build cars in the UK!