Well this has been quite a day. On the way home from my in-laws' house, we saw a double rainbow. By the time we got home, it had dissipated somewhat, but it was very striking for the brief time that it lasted. I ran inside and grabbed the camera. Good thing too, because it dissipated completely right after I got my shot.
This is completely unretouched, and it conveys pretty well what I was seeing at the time I took it. The rainbow was quite a bit more intense in the few minutes before this was taken. The vestiges of the double rainbow are just barely visible above the main one.