While I was taking pictures, I was also doing a time-lapse video. When you see a certain type of clouding, there's usually a good chance that some secondary color will pop up after the sun sets - sometimes spectacularly. On rare occasions, tertiary color is a possibility.
Accurate color is not the strong point of this old camcorder - the yellow and red are a bit weak and the dark gray clouds came out blue. Shooting video of that tape off the TV screen with my cellphone doesn't help, but you get the idea that it was kinda cool-looking.
The recording was set for 1 second every 30 seconds, so this 30-second video covers 15 minutes of real time.
http://img299.imageshack.us/flvplayer.swf?f=Mvideo0391