We were in the trailer in an RV near Bishop, California, late one afternoon. I noticed the guy behind us was staring up at the sky. I went outside to check it out, and saw the wildest clouds ever. It wasn't quite sunset yet, but the clouds were starting to get color. Most of these are pretty small formations, but the wind was blowing up high and the clouds kept changing. These were all taken within about 10 minutes.
More (different) pictures here: Clouds