images- tri pictures

I am trying (well stuggling) to write a letter attempting to get people to sponsor the triathlon that I am putting on, and I need some sort of header for the top of my page. An image that makes people think triathlon. (and I really want to donate to this girl... even if its just a door prize!)

I have seen some good ones floating around. Would anyone mind reposting? Thankyou so much!!

 Jamie