Rajan,
I finally got to show these, and the video, to my wife, who also found them stunning.
I will soon post a few of my favorites from my 1974 Iceland trip, including my one bubbling mud pit. These will be in a separate thread, because they are mostly of historic interest, and not in a league with your Iceland work.
Cheers,
Eric
P.S. Of course terrain similar to your first image can be found in Death Valley, but without the color.