Interesting catch. You could have brought the colours up with some processing. Try manipulating the levels in photoshop or a similar program, or at least just increasing the contrast.
Here's what I got with a little bit of playing around: //lisa3d.org/images/photos/dpc/pisky2.jpg. It's grainy, but the colours are stronger.
I get one over-riding ipression from this...Grey. I like the creative stretch for the subject but the grey is so overwhelming it diminishes the overall shot.
Good try trying to get the sky to give you your Pi . . . Looks like it may have worked though, slightly. don't what to say, nice green and black border you've got. really dark sky, nice whitish cloud making up the Pi