Waiting for the fireworks to start I captured this image. No, I didn't do anything to make the sky look that way, that's just how it turned out. In fact, I didn't do much post processing to this image at all, just brought the exposure down on the grass in the foreground. This is not an HDR either.
It was pretty dark out when I took this photo but with the long exposure there was enough color in the sky left to look like this. I also like the tail lights of the car going through the train windows-nice touch.