Is it just me, or does the blue background have a ripple reflection pattern, indicative of something like WATER? :-P
Either that, or it's some kind of lighting effect - kinda like the light from a blue cold cathode vision target.....
I'm all for diamond plate as a field material - gives us an excuse to get more to build a new controls carrying box this year.
The filename of the picture is "2007Clue1.jpg", which leads me to believe other clues could be posted later, or that in the very least, other clue photos exist.