Does anyone have a physical mailing address for coldplay that has gotten any results such as autographs and what not?? Not really interested in autographs, but just wanting to tell the band how thankful i am for their music.

I don't think they do that kind of stuff. However there was an PO Box address for the Postcards From Far Away project, try searching that thread if you want to send them anything :)

Try this thread :).